Resolve conflicts

components/apimgt-extensions/io.entgra.device.mgt.core.apimgt.webapp.publisher/src/main/java/io/entgra/device/mgt/core/apimgt/webapp/publisher/APIPublisherServiceImpl.java

@@ -41,18 +41,11 @@ import io.entgra.device.mgt.core.apimgt.webapp.publisher.exception.APIManagerPub
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.wso2.carbon.apimgt.api.model.Documentation;
-import org.wso2.carbon.apimgt.api.model.DocumentationType;
 import org.json.JSONArray;
 import org.json.JSONObject;
 import org.wso2.carbon.apimgt.api.APIManagementException;
 import org.wso2.carbon.apimgt.api.APIProvider;
 import org.wso2.carbon.apimgt.api.model.APIIdentifier;
-import org.wso2.carbon.apimgt.api.model.APIRevision;
-import org.wso2.carbon.apimgt.api.model.APIRevisionDeployment;
-import org.wso2.carbon.apimgt.api.model.CORSConfiguration;
-import org.wso2.carbon.apimgt.api.model.Mediation;
-import org.wso2.carbon.apimgt.api.model.Scope;
 import org.wso2.carbon.apimgt.impl.APIConstants;
 import org.wso2.carbon.apimgt.impl.APIManagerFactory;
 import org.wso2.carbon.apimgt.impl.utils.APIUtil;

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/DepConfig.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.common;
+
+public class DepConfig {
+
+    private String agentPackageName;
+    private String consumerKey;
+    private String consumerSecret;
+    private String accessToken;
+    private String accessSecret;
+    private String accessTokenExpiry;
+    private String vppToken;
+
+    public String getAgentPackageName() {
+        return agentPackageName;
+    }
+
+    public void setAgentPackageName(String agentPackageName) {
+        this.agentPackageName = agentPackageName;
+    }
+
+    public String getConsumerKey() {
+        return consumerKey;
+    }
+
+    public void setConsumerKey(String consumerKey) {
+        this.consumerKey = consumerKey;
+    }
+
+    public String getConsumerSecret() {
+        return consumerSecret;
+    }
+
+    public void setConsumerSecret(String consumerSecret) {
+        this.consumerSecret = consumerSecret;
+    }
+
+    public String getAccessToken() {
+        return accessToken;
+    }
+
+    public void setAccessToken(String accessToken) {
+        this.accessToken = accessToken;
+    }
+
+    public String getVppToken() {
+        return vppToken;
+    }
+
+    public void setVppToken(String vppToken) {
+        this.vppToken = vppToken;
+    }
+
+    public String getAccessSecret() {
+        return accessSecret;
+    }
+
+    public void setAccessSecret(String accessSecret) {
+        this.accessSecret = accessSecret;
+    }
+
+    public String getAccessTokenExpiry() {
+        return accessTokenExpiry;
+    }
+
+    public void setAccessTokenExpiry(String accessTokenExpiry) {
+        this.accessTokenExpiry = accessTokenExpiry;
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/ItuneAppDTO.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+public class ItuneAppDTO {
+    int id;
+    String packageName;
+    String version;
+    String description;
+    String title;
+    String paymentMethod;
+    String iconURL;
+    String category;
+
+    public String getCategory() {
+        return category;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
+
+    public String getIconURL() {
+        return iconURL;
+    }
+
+    public void setIconURL(String iconURL) {
+        this.iconURL = iconURL;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getPackageName() {
+        return packageName;
+    }
+
+    public void setPackageName(String packageName) {
+        this.packageName = packageName;
+    }
+
+
+    public String getVersion() {
+        return version;
+    }
+
+    public void setVersion(String version) {
+        this.version = version;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getPaymentMethod() {
+        return paymentMethod;
+    }
+
+    public void setPaymentMethod(String paymentMethod) {
+        this.paymentMethod = paymentMethod;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/ProxyResponse.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+public class ProxyResponse {
+
+    private int code;
+    private String data;
+    private String executorResponse;
+
+    public int getCode() { return code; }
+
+    public void setCode(int code) { this.code = code; }
+
+    public String getData() { return data; }
+
+    public void setData(String data) { this.data = data; }
+
+    public String getExecutorResponse() { return executorResponse; }
+
+    public void setExecutorResponse(String executorResponse) { this.executorResponse = executorResponse; }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/VppAssetDTO.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+public class VppAssetDTO extends VppItuneAssetDTO {
+    int id;
+    int appId;
+    int tenantId;
+    String createdTime;
+    String lastUpdatedTime;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public int getAppId() {
+        return appId;
+    }
+
+    public void setAppId(int appId) {
+        this.appId = appId;
+    }
+
+    public int getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(int tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public String getCreatedTime() {
+        return createdTime;
+    }
+
+    public void setCreatedTime(String createdTime) {
+        this.createdTime = createdTime;
+    }
+
+    public String getLastUpdatedTime() {
+        return lastUpdatedTime;
+    }
+
+    public void setLastUpdatedTime(String lastUpdatedTime) {
+        this.lastUpdatedTime = lastUpdatedTime;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/VppAssociationDTO.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+public class VppAssociationDTO {
+    int id;
+    String adamId;
+    String clientUserId;
+    String pricingParam;
+    String associationType;
+
+    int assetId;
+    int clientId;
+    int tenantId;
+    String createdTime;
+    String lastUpdatedTime;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getAdamId() {
+        return adamId;
+    }
+
+    public void setAdamId(String adamId) {
+        this.adamId = adamId;
+    }
+
+    public String getClientUserId() {
+        return clientUserId;
+    }
+
+    public void setClientUserId(String clientUserId) {
+        this.clientUserId = clientUserId;
+    }
+
+    public String getPricingParam() {
+        return pricingParam;
+    }
+
+    public void setPricingParam(String pricingParam) {
+        this.pricingParam = pricingParam;
+    }
+
+    public String getAssociationType() {
+        return associationType;
+    }
+
+    public void setAssociationType(String associationType) {
+        this.associationType = associationType;
+    }
+
+    public int getAssetId() {
+        return assetId;
+    }
+
+    public void setAssetId(int assetId) {
+        this.assetId = assetId;
+    }
+
+    public int getClientId() {
+        return clientId;
+    }
+
+    public void setClientId(int clientId) {
+        this.clientId = clientId;
+    }
+
+    public int getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(int tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public String getCreatedTime() {
+        return createdTime;
+    }
+
+    public void setCreatedTime(String createdTime) {
+        this.createdTime = createdTime;
+    }
+
+    public String getLastUpdatedTime() {
+        return lastUpdatedTime;
+    }
+
+    public void setLastUpdatedTime(String lastUpdatedTime) {
+        this.lastUpdatedTime = lastUpdatedTime;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/VppItuneAssetDTO.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the String LicenseString ); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * String AS ISString  BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+import java.util.List;
+
+public class VppItuneAssetDTO {
+
+
+    String adamId;
+    String assignedCount;
+    String availableCount;
+    String deviceAssignable;
+    String pricingParam;
+    String productType;
+    String retiredCount;
+    String revocable;
+
+    List<String> supportedPlatforms;
+
+    public List<String> getSupportedPlatforms() {
+        return supportedPlatforms;
+    }
+
+    public void setSupportedPlatforms(List<String> supportedPlatforms) {
+        this.supportedPlatforms = supportedPlatforms;
+    }
+
+    public String getAdamId() {
+        return adamId;
+    }
+
+    public void setAdamId(String adamId) {
+        this.adamId = adamId;
+    }
+
+    public String getAssignedCount() {
+        return assignedCount;
+    }
+
+    public void setAssignedCount(String assignedCount) {
+        this.assignedCount = assignedCount;
+    }
+
+    public String getAvailableCount() {
+        return availableCount;
+    }
+
+    public void setAvailableCount(String availableCount) {
+        this.availableCount = availableCount;
+    }
+
+    public String getDeviceAssignable() {
+        return deviceAssignable;
+    }
+
+    public void setDeviceAssignable(String deviceAssignable) {
+        this.deviceAssignable = deviceAssignable;
+    }
+
+    public String getPricingParam() {
+        return pricingParam;
+    }
+
+    public void setPricingParam(String pricingParam) {
+        this.pricingParam = pricingParam;
+    }
+
+    public String getProductType() {
+        return productType;
+    }
+
+    public void setProductType(String productType) {
+        this.productType = productType;
+    }
+
+    public String getRetiredCount() {
+        return retiredCount;
+    }
+
+    public void setRetiredCount(String retiredCount) {
+        this.retiredCount = retiredCount;
+    }
+
+    public String getRevocable() {
+        return revocable;
+    }
+
+    public void setRevocable(String revocable) {
+        this.revocable = revocable;
+    }
+
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/VppItuneUserDTO.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+public class VppItuneUserDTO {
+    String clientUserId;
+    String inviteCode;
+    String status;
+    String email;
+    String managedId;
+
+    public String getClientUserId() {
+        return clientUserId;
+    }
+
+    public void setClientUserId(String clientUserId) {
+        this.clientUserId = clientUserId;
+    }
+
+    public String getInviteCode() {
+        return inviteCode;
+    }
+
+    public void setInviteCode(String inviteCode) {
+        this.inviteCode = inviteCode;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getManagedId() {
+        return managedId;
+    }
+
+    public void setManagedId(String managedId) {
+        this.managedId = managedId;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/VppPaginationDTO.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+public class VppPaginationDTO {
+
+    int currentPageIndex;
+    int size;
+    String tokenExpirationDate;
+    int nextPageIndex;
+    int totalPages;
+    String uId;
+    String versionId;
+
+    public int getCurrentPageIndex() {
+        return currentPageIndex;
+    }
+
+    public void setCurrentPageIndex(int currentPageIndex) {
+        this.currentPageIndex = currentPageIndex;
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public void setSize(int size) {
+        this.size = size;
+    }
+
+    public String getTokenExpirationDate() {
+        return tokenExpirationDate;
+    }
+
+    public void setTokenExpirationDate(String tokenExpirationDate) {
+        this.tokenExpirationDate = tokenExpirationDate;
+    }
+
+    public int getNextPageIndex() {
+        return nextPageIndex;
+    }
+
+    public void setNextPageIndex(int nextPageIndex) {
+        this.nextPageIndex = nextPageIndex;
+    }
+
+    public int getTotalPages() {
+        return totalPages;
+    }
+
+    public void setTotalPages(int totalPages) {
+        this.totalPages = totalPages;
+    }
+
+    public String getuId() {
+        return uId;
+    }
+
+    public void setuId(String uId) {
+        this.uId = uId;
+    }
+
+    public String getVersionId() {
+        return versionId;
+    }
+
+    public void setVersionId(String versionId) {
+        this.versionId = versionId;
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/dto/VppUserDTO.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.dto;
+
+public class VppUserDTO extends VppItuneUserDTO {
+    int id;
+    String dmUsername;
+    int tenantId;
+    String createdTime;
+    String lastUpdatedTime;
+    String tmpPassword;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getDmUsername() {
+        return dmUsername;
+    }
+
+    public void setDmUsername(String dmUsername) {
+        this.dmUsername = dmUsername;
+    }
+
+    public int getTenantId() {
+        return tenantId;
+    }
+
+    public void setTenantId(int tenantId) {
+        this.tenantId = tenantId;
+    }
+
+    public String getCreatedTime() {
+        return createdTime;
+    }
+
+    public void setCreatedTime(String createdTime) {
+        this.createdTime = createdTime;
+    }
+
+    public String getLastUpdatedTime() {
+        return lastUpdatedTime;
+    }
+
+    public void setLastUpdatedTime(String lastUpdatedTime) {
+        this.lastUpdatedTime = lastUpdatedTime;
+    }
+
+    public String getTmpPassword() {
+        return tmpPassword;
+    }
+
+    public void setTmpPassword(String tmpPassword) {
+        this.tmpPassword = tmpPassword;
+    }
+
+    @Override
+    public String toString() {
+        return "VppUserDTO{" +
+                "id=" + id +
+                ", dmUsername='" + dmUsername + '\'' +
+                ", tenantId=" + tenantId +
+                ", createdTime='" + createdTime + '\'' +
+                ", lastUpdatedTime='" + lastUpdatedTime + '\'' +
+                ", tmpPassword='" + tmpPassword + '\'' +
+                ", clientUserId='" + clientUserId + '\'' +
+                ", inviteCode='" + inviteCode + '\'' +
+                ", status='" + status + '\'' +
+                ", email='" + email + '\'' +
+                ", managedId='" + managedId + '\'' +
+                '}';
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/response/Application.java

@@ -108,6 +108,12 @@ public class Application {
             value = "if the app is favoured by the user")
     private boolean isFavourite;
 
+    @ApiModelProperty(name = "isExternalAppStoreApp",
+            value = "Is the app coming from an external application store",
+            required = true,
+            example = "true or false")
+    private boolean isExternalAppStoreApp;
+
     public String getPackageName() {
         return packageName;
     }
@@ -194,4 +200,12 @@ public class Application {
     public void setFavourite(boolean favourite) {
         isFavourite = favourite;
     }
+
+    public boolean isExternalAppStoreApp() {
+        return isExternalAppStoreApp;
+    }
+
+    public void setExternalAppStoreApp(boolean externalAppStoreApp) {
+        isExternalAppStoreApp = externalAppStoreApp;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/services/ApplicationManager.java

@@ -27,6 +27,7 @@ import io.entgra.device.mgt.core.application.mgt.common.response.Category;
 import io.entgra.device.mgt.core.application.mgt.common.response.Tag;
 import io.entgra.device.mgt.core.device.mgt.common.Base64File;
 import io.entgra.device.mgt.core.application.mgt.common.dto.ApplicationDTO;
+import io.entgra.device.mgt.core.device.mgt.common.PaginationRequest;
 import io.entgra.device.mgt.core.device.mgt.common.exceptions.MetadataManagementException;
 import org.apache.cxf.jaxrs.ext.multipart.Attachment;
 import io.entgra.device.mgt.core.application.mgt.common.ApplicationArtifact;
@@ -273,6 +274,17 @@ public interface ApplicationManager {
      */
     ApplicationDTO getApplication(int applicationId) throws ApplicationManagementException;
 
+    /**
+     * This method is responsible to provide application data for given deviceId.
+     *
+     * @param  deviceId id of the device
+     * @return {@link ApplicationDTO}
+     * @throws ApplicationManagementException
+     * if an error occurred while getting subscribed app details for relevant device id,
+     */
+    ApplicationList getSubscribedAppsOfDevice(int deviceId, PaginationRequest request)
+            throws ApplicationManagementException;
+
     /**
      * To get the Application for given Id.
      *

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/services/VPPApplicationManager.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.common.services;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.ProxyResponse;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssociationDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.exception.ApplicationManagementException;
+
+import java.io.IOException;
+import java.util.List;
+
+public interface VPPApplicationManager {
+
+    VppUserDTO addUser(VppUserDTO userDTO) throws ApplicationManagementException;
+
+    VppUserDTO getUserByDMUsername(String emmUsername) throws ApplicationManagementException;
+
+    void updateUser(VppUserDTO userDTO) throws ApplicationManagementException;
+
+    void syncUsers(String clientId) throws ApplicationManagementException;
+
+    void syncAssets(int nextPageIndex) throws ApplicationManagementException;
+
+    VppAssetDTO getAssetByAppId(int appId) throws ApplicationManagementException;
+
+    ProxyResponse callVPPBackend(String url, String payload, String accessToken, String method) throws IOException;
+
+    boolean addAssociation(VppAssetDTO asset, List<VppUserDTO> vppUsers) throws
+            ApplicationManagementException;
+
+    VppAssociationDTO getAssociation(int assetId, int userId)  throws ApplicationManagementException;
+
+    VppAssociationDTO getUserAssociation(String adamId, String emmUsername) throws ApplicationManagementException;
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/VppAssociateRequestWrapper.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.wrapper;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppItuneAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppItuneUserDTO;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VppAssociateRequestWrapper {
+
+    List<VppItuneAssetDTO> assets;
+    List<String> clientUserIds;
+
+    public List<VppItuneAssetDTO> getAssets() {
+        return assets;
+    }
+
+    public void setAssets(List<VppItuneAssetDTO> assets) {
+        this.assets = assets;
+    }
+
+    public List<String> getClientUserIds() {
+        return clientUserIds;
+    }
+
+    public void setClientUserIds(List<String> clientUserIds) {
+        this.clientUserIds = clientUserIds;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/VppItuneAssetResponseWrapper.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.wrapper;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppItuneUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppPaginationDTO;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VppItuneAssetResponseWrapper extends VppPaginationDTO {
+
+    List<VppAssetDTO> assets;
+    
+    public List<VppAssetDTO> getAssets() {
+        return assets;
+    }
+
+    public void setAssets(List<VppAssetDTO> assets) {
+        this.assets = assets;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/VppItuneUserRequestWrapper.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.wrapper;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppItuneUserDTO;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VppItuneUserRequestWrapper {
+
+    List<VppItuneUserDTO> users;
+
+    public VppItuneUserRequestWrapper() {
+        users = new ArrayList<>();
+    }
+    public List<VppItuneUserDTO> getUser() {
+        return users;
+    }
+
+    public void setUser(List<VppItuneUserDTO> users) {
+        this.users = users;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.common/src/main/java/io/entgra/device/mgt/core/application/mgt/common/wrapper/VppItuneUserResponseWrapper.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package io.entgra.device.mgt.core.application.mgt.common.wrapper;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppItuneUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppPaginationDTO;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VppItuneUserResponseWrapper extends VppPaginationDTO {
+
+    List<VppItuneUserDTO> users;
+
+    public VppItuneUserResponseWrapper() {
+        users = new ArrayList<>();
+    }
+    public List<VppItuneUserDTO> getUser() {
+        return users;
+    }
+
+    public void setUser(List<VppItuneUserDTO> users) {
+        this.users = users;
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/ApplicationDAO.java

@@ -22,6 +22,7 @@ import io.entgra.device.mgt.core.application.mgt.common.dto.ApplicationDTO;
 import io.entgra.device.mgt.core.application.mgt.common.dto.CategoryDTO;
 import io.entgra.device.mgt.core.application.mgt.common.dto.TagDTO;
 import io.entgra.device.mgt.core.application.mgt.core.exception.ApplicationManagementDAOException;
+import io.entgra.device.mgt.core.device.mgt.common.PaginationRequest;
 
 import java.util.List;
 
@@ -150,6 +151,16 @@ public interface ApplicationDAO {
      */
     ApplicationDTO getApplication(int applicationId, int tenantId) throws ApplicationManagementDAOException;
 
+    /**
+     * To get the application with the given id
+     *
+     * @param deviceId ID of the device which the apps are installed on.
+     * @param tenantId ID of the tenant.
+     * @return the application
+     * @throws ApplicationManagementDAOException ApplicationDTO Management DAO Exception.
+     */
+    List<ApplicationDTO> getSubscribedAppsOfDevice(int deviceId, int tenantId, PaginationRequest request) throws ApplicationManagementDAOException;
+
     /**
      * To get the application with the given uuid
      *

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/VppApplicationDAO.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.core.dao;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssociationDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import io.entgra.device.mgt.core.application.mgt.core.exception.ApplicationManagementDAOException;
+
+
+public interface VppApplicationDAO {
+
+    int addVppUser(VppUserDTO userDTO, int tenantId) throws ApplicationManagementDAOException;
+
+    VppUserDTO updateVppUser(VppUserDTO userDTO, int tenantId) throws ApplicationManagementDAOException;
+
+    VppUserDTO getUserByDMUsername(String emmUsername, int tenantId) throws ApplicationManagementDAOException;
+
+    VppAssetDTO getAssetByAppId(int appId, int tenantId) throws ApplicationManagementDAOException;
+
+    int addAsset(VppAssetDTO vppAssetDTO, int tenantId) throws ApplicationManagementDAOException;
+
+    VppAssetDTO updateAsset(VppAssetDTO vppAssetDTO, int tenantId) throws ApplicationManagementDAOException;
+
+    VppAssociationDTO getAssociation(int assetId, int userId, int tenantId) throws ApplicationManagementDAOException;
+
+    int addAssociation(VppAssociationDTO vppAssociationDTO, int tenantId) throws ApplicationManagementDAOException;
+
+    VppAssociationDTO updateAssociation(VppAssociationDTO vppAssociationDTO, int tenantId) throws ApplicationManagementDAOException;
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/common/ApplicationManagementDAOFactory.java

@@ -17,7 +17,7 @@
  */
 package io.entgra.device.mgt.core.application.mgt.core.dao.common;
 
-import io.entgra.device.mgt.core.application.mgt.core.dao.SPApplicationDAO;
+import io.entgra.device.mgt.core.application.mgt.core.dao.*;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.application.spapplication.GenericSPApplicationDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.application.spapplication.OracleSPApplicationDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.application.spapplication.PostgreSQLSPApplicationDAOImpl;
@@ -26,16 +26,14 @@ import io.entgra.device.mgt.core.application.mgt.core.dao.impl.visibility.Generi
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.visibility.OracleVisibilityDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.visibility.PostgreSQLVisibilityDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.visibility.SQLServerVisibilityDAOImpl;
+import io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp.GenericVppApplicationDAOImpl;
+import io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp.OracleVppApplicationDAOImpl;
+import io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp.PostgreSQLVppApplicationDAO;
+import io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp.SQLServerVppApplicationDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.util.Constants;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import io.entgra.device.mgt.core.application.mgt.common.exception.UnsupportedDatabaseEngineException;
-import io.entgra.device.mgt.core.application.mgt.core.dao.ApplicationDAO;
-import io.entgra.device.mgt.core.application.mgt.core.dao.ApplicationReleaseDAO;
-import io.entgra.device.mgt.core.application.mgt.core.dao.LifecycleStateDAO;
-import io.entgra.device.mgt.core.application.mgt.core.dao.ReviewDAO;
-import io.entgra.device.mgt.core.application.mgt.core.dao.SubscriptionDAO;
-import io.entgra.device.mgt.core.application.mgt.core.dao.VisibilityDAO;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.application.PostgreSQLApplicationDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.application.SQLServerApplicationDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.dao.impl.application.release.OracleApplicationReleaseDAOImpl;
@@ -232,4 +230,28 @@ public class ApplicationManagementDAOFactory {
         }
         throw new IllegalStateException("Database engine has not initialized properly.");
     }
+
+
+    /**
+     * To get the instance of VppApplicationImplementation of the particular database engine.
+     * @return specific VppApplicationImplementation
+     */
+    public static VppApplicationDAO getVppApplicationDAO() {
+        if (databaseEngine != null) {
+            switch (databaseEngine) {
+                case Constants.DataBaseTypes.DB_TYPE_H2:
+                case Constants.DataBaseTypes.DB_TYPE_MYSQL:
+                    return new GenericVppApplicationDAOImpl();
+                case Constants.DataBaseTypes.DB_TYPE_POSTGRESQL:
+                    return new PostgreSQLVppApplicationDAO();
+                case Constants.DataBaseTypes.DB_TYPE_ORACLE:
+                    return new OracleVppApplicationDAOImpl();
+                case Constants.DataBaseTypes.DB_TYPE_MSSQL:
+                    return new SQLServerVppApplicationDAOImpl();
+                default:
+                    throw new UnsupportedDatabaseEngineException("Unsupported database engine : " + databaseEngine);
+            }
+        }
+        throw new IllegalStateException("Database engine has not initialized properly.");
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/impl/application/GenericApplicationDAOImpl.java

@@ -22,6 +22,7 @@ import io.entgra.device.mgt.core.application.mgt.core.dao.impl.AbstractDAOImpl;
 import io.entgra.device.mgt.core.application.mgt.core.exception.UnexpectedServerErrorException;
 import io.entgra.device.mgt.core.application.mgt.core.util.Constants;
 import io.entgra.device.mgt.core.application.mgt.core.util.DAOUtil;
+import io.entgra.device.mgt.core.device.mgt.common.PaginationRequest;
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -656,6 +657,84 @@ public class GenericApplicationDAOImpl extends AbstractDAOImpl implements Applic
         }
     }
 
+    @Override
+    public  List<ApplicationDTO> getSubscribedAppsOfDevice(int deviceId, int tenantId, PaginationRequest request) throws
+            ApplicationManagementDAOException {
+        if (log.isDebugEnabled()) {
+            log.debug("Getting all installed apps of device " + deviceId
+                    + " from the database");
+        }
+        List<ApplicationDTO> appList = null;
+
+        String sql = "SELECT "
+                + "AP_APP.ID AS APP_ID, "
+                + "AP_APP.NAME AS APP_NAME, "
+                + "AP_APP.DESCRIPTION AS APP_DESCRIPTION, "
+                + "AP_APP.TYPE AS APP_TYPE, "
+                + "AP_APP.STATUS AS APP_STATUS, "
+                + "AP_APP.SUB_TYPE AS APP_SUB_TYPE, "
+                + "AP_APP.CURRENCY AS APP_CURRENCY, "
+                + "AP_APP.RATING AS APP_RATING, "
+                + "AP_APP.DEVICE_TYPE_ID AS APP_DEVICE_TYPE_ID, "
+                + "AP_APP_RELEASE.ID AS RELEASE_ID, "
+                + "AP_APP_RELEASE.DESCRIPTION AS RELEASE_DESCRIPTION, "
+                + "AP_APP_RELEASE.VERSION AS RELEASE_VERSION, "
+                + "AP_APP_RELEASE.UUID AS RELEASE_UUID, "
+                + "AP_APP_RELEASE.RELEASE_TYPE AS RELEASE_TYPE, "
+                + "AP_APP_RELEASE.INSTALLER_LOCATION AS AP_RELEASE_STORED_LOC, "
+                + "AP_APP_RELEASE.ICON_LOCATION AS AP_RELEASE_ICON_LOC, "
+                + "AP_APP_RELEASE.BANNER_LOCATION AS AP_RELEASE_BANNER_LOC, "
+                + "AP_APP_RELEASE.SC_1_LOCATION AS AP_RELEASE_SC1, "
+                + "AP_APP_RELEASE.SC_2_LOCATION AS AP_RELEASE_SC2, "
+                + "AP_APP_RELEASE.SC_3_LOCATION AS AP_RELEASE_SC3, "
+                + "AP_APP_RELEASE.APP_HASH_VALUE AS RELEASE_HASH_VALUE, "
+                + "AP_APP_RELEASE.APP_PRICE AS RELEASE_PRICE, "
+                + "AP_APP_RELEASE.APP_META_INFO AS RELEASE_META_INFO, "
+                + "AP_APP_RELEASE.PACKAGE_NAME AS PACKAGE_NAME, "
+                + "AP_APP_RELEASE.SUPPORTED_OS_VERSIONS AS RELEASE_SUP_OS_VERSIONS, "
+                + "AP_APP_RELEASE.RATING AS RELEASE_RATING, "
+                + "AP_APP_RELEASE.CURRENT_STATE AS RELEASE_CURRENT_STATE, "
+                + "AP_APP_RELEASE.RATED_USERS AS RATED_USER_COUNT "
+                + "FROM AP_APP "
+                + "JOIN AP_APP_RELEASE ON AP_APP.ID = AP_APP_RELEASE.AP_APP_ID "
+                + "JOIN AP_DEVICE_SUBSCRIPTION ON AP_APP_RELEASE.ID = AP_DEVICE_SUBSCRIPTION.AP_APP_RELEASE_ID "
+                + "WHERE AP_DEVICE_SUBSCRIPTION.DM_DEVICE_ID = ? AND AP_DEVICE_SUBSCRIPTION.TENANT_ID= ? "
+                +"AND AP_DEVICE_SUBSCRIPTION.STATUS= 'COMPLETED'";
+
+        if (request != null)  {
+            sql = sql + " LIMIT ?,?";
+        }
+
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, deviceId);
+                stmt.setInt(2, tenantId);
+                if (request != null)  {
+                    stmt.setInt(3, request.getStartIndex());
+                    stmt.setInt(4, request.getRowCount());
+                }
+                try (ResultSet rs = stmt.executeQuery()) {
+                    appList = new ArrayList<>();
+                    while (rs.next()) {
+                        ApplicationDTO app =  DAOUtil.loadDeviceApp(rs);
+                        appList.add(app);
+                    }
+                    return appList;
+                }
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining the DB connection for getting all apps installed on the device of "
+                    + "device Id: " + deviceId + ".";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred while while running SQL to get all installed apps of device with device Id: " + deviceId;
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
     @Override
     public boolean updateApplication(ApplicationDTO applicationDTO, int tenantId)
             throws ApplicationManagementDAOException {

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/impl/vpp/GenericVppApplicationDAOImpl.java

@@ -0,0 +1,508 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssociationDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.exception.DBConnectionException;
+import io.entgra.device.mgt.core.application.mgt.core.dao.VppApplicationDAO;
+import io.entgra.device.mgt.core.application.mgt.core.dao.impl.AbstractDAOImpl;
+import io.entgra.device.mgt.core.application.mgt.core.exception.ApplicationManagementDAOException;
+import io.entgra.device.mgt.core.application.mgt.core.exception.UnexpectedServerErrorException;
+import io.entgra.device.mgt.core.application.mgt.core.util.DAOUtil;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import java.sql.*;
+import java.util.List;
+
+public class GenericVppApplicationDAOImpl  extends AbstractDAOImpl implements VppApplicationDAO {
+    private static final Log log = LogFactory.getLog(GenericVppApplicationDAOImpl.class);
+
+    @Override
+    public int addVppUser(VppUserDTO userDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+        int vppUserId = -1;
+        String sql = "INSERT INTO "
+                + "AP_VPP_USER("
+                + "CLIENT_USER_ID, "
+                + "DM_USERNAME, "
+                + "TENANT_ID, "
+                + "EMAIL, "
+                + "INVITE_CODE, "
+                + "STATUS,"
+                + "CREATED_TIME,"
+                + "LAST_UPDATED_TIME,"
+                + "MANAGED_ID,"
+                + "TEMP_PASSWORD) "
+                + "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+                long currentTime = System.currentTimeMillis();
+                stmt.setString(1, userDTO.getClientUserId());
+                stmt.setString(2, userDTO.getDmUsername());
+                stmt.setInt(3, tenantId);
+                stmt.setString(4, userDTO.getEmail());
+                stmt.setString(5, userDTO.getInviteCode());
+                stmt.setString(6, userDTO.getStatus());
+                stmt.setLong(7, currentTime);
+                stmt.setLong(8, currentTime);
+                stmt.setString(9, userDTO.getManagedId());
+                stmt.setString(10, userDTO.getTmpPassword());
+                stmt.executeUpdate();
+                try (ResultSet rs = stmt.getGeneratedKeys()) {
+                    if (rs.next()) {
+                        vppUserId = rs.getInt(1);
+                    }
+                }
+                return vppUserId;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when adding the vpp user";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to add  the vpp user.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public VppUserDTO updateVppUser(VppUserDTO userDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+
+        String sql = "UPDATE AP_VPP_USER SET ";
+        if (userDTO.getClientUserId() != null && !userDTO.getClientUserId().isEmpty()) {
+            sql += "CLIENT_USER_ID = ?,";
+        }
+        if (userDTO.getDmUsername() != null && !userDTO.getDmUsername().isEmpty()) {
+            sql += "DM_USERNAME = ?,";
+        }
+        if (userDTO.getEmail() != null && !userDTO.getEmail().isEmpty()) {
+            sql += "EMAIL = ?,";
+        }
+        if (userDTO.getInviteCode() != null && !userDTO.getInviteCode().isEmpty()) {
+            sql += "INVITE_CODE = ?,";
+        }
+        if (userDTO.getStatus() != null && !userDTO.getStatus().isEmpty()) {
+            sql += "STATUS = ?,";
+        }
+        if (userDTO.getManagedId() != null && !userDTO.getManagedId().isEmpty()) {
+            sql += "MANAGED_ID = ?,";
+        }
+        if (userDTO.getTmpPassword() != null && !userDTO.getTmpPassword().isEmpty()) {
+            sql += "TEMP_PASSWORD = ?,";
+        }
+
+        sql += " TENANT_ID = ?, LAST_UPDATED_TIME = ? WHERE ID = ?";
+
+        try {
+            Connection conn = this.getDBConnection();
+            long updatedTime = System.currentTimeMillis();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                int x = 0;
+
+                if (userDTO.getClientUserId() != null && !userDTO.getClientUserId().isEmpty()) {
+                    stmt.setString(++x, userDTO.getClientUserId());
+                }
+                if (userDTO.getDmUsername() != null && !userDTO.getDmUsername().isEmpty()) {
+                    stmt.setString(++x, userDTO.getDmUsername());
+                }
+                if (userDTO.getEmail() != null && !userDTO.getEmail().isEmpty()) {
+                    stmt.setString(++x, userDTO.getEmail());
+                }
+                if (userDTO.getInviteCode() != null && !userDTO.getInviteCode().isEmpty()) {
+                    stmt.setString(++x, userDTO.getInviteCode());
+                }
+                if (userDTO.getStatus() != null && !userDTO.getStatus().isEmpty()) {
+                    stmt.setString(++x, userDTO.getStatus());
+                }
+                if (userDTO.getManagedId() != null && !userDTO.getManagedId().isEmpty()) {
+                    stmt.setString(++x, userDTO.getManagedId());
+                }
+                if (userDTO.getTmpPassword() != null && !userDTO.getTmpPassword().isEmpty()) {
+                    stmt.setString(++x, userDTO.getTmpPassword());
+                }
+                stmt.setInt(++x, tenantId);
+                stmt.setLong(++x, updatedTime);
+                stmt.setInt(++x, userDTO.getId());
+                if (stmt.executeUpdate() == 1) {
+                    return userDTO;
+                }
+                return null;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when updating the vpp user";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to updating the vpp user.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public VppUserDTO getUserByDMUsername(String emmUsername, int tenantId)
+            throws ApplicationManagementDAOException {
+        String sql = "SELECT "
+                + "ID, "
+                + "CLIENT_USER_ID, "
+                + "TENANT_ID, "
+                + "EMAIL, "
+                + "INVITE_CODE, "
+                + "STATUS, "
+                + "CREATED_TIME, "
+                + "LAST_UPDATED_TIME, "
+                + "MANAGED_ID, "
+                + "TEMP_PASSWORD, "
+                + "DM_USERNAME "
+                + "FROM AP_VPP_USER "
+                + "WHERE DM_USERNAME = ? AND TENANT_ID = ?";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setString(1, emmUsername);
+                stmt.setInt(2, tenantId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    return DAOUtil.loadVppUser(rs);
+                }
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when retrieving vpp user by EMM Username.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to retrieve vpp user by EMM Username.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (UnexpectedServerErrorException e) {
+            String msg = "Found more than one user for: " + emmUsername;
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public VppAssetDTO getAssetByAppId(int appId, int tenantId)
+            throws ApplicationManagementDAOException {
+        String sql = "SELECT "
+                + "ID, "
+                + "APP_ID, "
+                + "TENANT_ID, "
+                + "CREATED_TIME, "
+                + "LAST_UPDATED_TIME, "
+                + "ADAM_ID, "
+                + "ASSIGNED_COUNT, "
+                + "DEVICE_ASSIGNABLE, "
+                + "PRICING_PARAMS, "
+                + "PRODUCT_TYPE, "
+                + "RETIRED_COUNT, "
+                + "REVOCABLE "
+//                + "SUPPORTED_PLATFORMS "
+                + "FROM AP_ASSETS "
+                + "WHERE APP_ID = ? AND TENANT_ID = ?";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, appId);
+                stmt.setInt(2, tenantId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    return DAOUtil.loadAsset(rs);
+                }
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when retrieving asset data of app id "+ appId;
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to retrieve asset by app id.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }  catch (UnexpectedServerErrorException e) {
+            String msg = "Found more than one app for app id: " + appId;
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public int addAsset(VppAssetDTO vppAssetDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+        int assetId = -1;
+        String sql = "INSERT INTO "
+                + "AP_ASSETS("
+                + "APP_ID, "
+                + "TENANT_ID, "
+                + "CREATED_TIME,"
+                + "LAST_UPDATED_TIME,"
+                + "ADAM_ID,"
+                + "ASSIGNED_COUNT,"
+                + "DEVICE_ASSIGNABLE,"
+                + "PRICING_PARAMS,"
+                + "PRODUCT_TYPE,"
+                + "RETIRED_COUNT,"
+                + "REVOCABLE, "
+                + "SUPPORTED_PLATFORMS) "
+                + "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+                long currentTime = System.currentTimeMillis();
+                stmt.setInt(1, vppAssetDTO.getAppId());
+                stmt.setInt(2, tenantId);
+                stmt.setLong(3, currentTime);
+                stmt.setLong(4, currentTime);
+                stmt.setString(5, vppAssetDTO.getAdamId());
+                stmt.setString(6, vppAssetDTO.getAssignedCount());
+                stmt.setString(7, vppAssetDTO.getDeviceAssignable());
+                stmt.setString(8, vppAssetDTO.getPricingParam());
+                stmt.setString(9, vppAssetDTO.getProductType());
+                stmt.setString(10, vppAssetDTO.getRetiredCount());
+                stmt.setString(11, vppAssetDTO.getRevocable());
+                List<String> platformList =  vppAssetDTO.getSupportedPlatforms();
+                String platformString = String.join(",", platformList);
+                stmt.setString(12, platformString);
+                stmt.executeUpdate();
+                try (ResultSet rs = stmt.getGeneratedKeys()) {
+                    if (rs.next()) {
+                        assetId = rs.getInt(1);
+                    }
+                }
+                return assetId;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when adding the asset.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to add the asset.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public VppAssetDTO updateAsset(VppAssetDTO vppAssetDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+
+        String sql = "UPDATE AP_ASSETS SET ";
+
+        if (vppAssetDTO.getAdamId() != null && !vppAssetDTO.getAdamId().isEmpty()) {
+            sql += "ADAM_ID = ?, ";
+        }
+        if (vppAssetDTO.getAssignedCount() != null && !vppAssetDTO.getAssignedCount().isEmpty()) {
+            sql += "ASSIGNED_COUNT = ?, ";
+        }
+        if (vppAssetDTO.getDeviceAssignable() != null && !vppAssetDTO.getDeviceAssignable().isEmpty()) {
+            sql += "DEVICE_ASSIGNABLE = ?, ";
+        }
+        if (vppAssetDTO.getPricingParam() != null && !vppAssetDTO.getPricingParam().isEmpty()) {
+            sql += "PRICING_PARAMS = ?, ";
+        }
+        if (vppAssetDTO.getProductType() != null && !vppAssetDTO.getProductType().isEmpty()) {
+            sql += "PRODUCT_TYPE = ?, ";
+        }
+        if (vppAssetDTO.getRetiredCount() != null && !vppAssetDTO.getRetiredCount().isEmpty()) {
+            sql += "RETIRED_COUNT = ?, ";
+        }
+        if (vppAssetDTO.getRevocable() != null && !vppAssetDTO.getRevocable().isEmpty()) {
+            sql += "REVOCABLE = ?, ";
+        }
+        if (vppAssetDTO.getSupportedPlatforms() != null && !vppAssetDTO.getSupportedPlatforms().isEmpty()) {
+            sql += "SUPPORTED_PLATFORMS = ?,";
+        }
+        sql += "APP_ID = ?, LAST_UPDATED_TIME = ? WHERE ID = ? AND TENANT_ID = ?";
+
+        try {
+            Connection conn = this.getDBConnection();
+            long updatedTime = System.currentTimeMillis();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                int x = 0;
+
+                if (vppAssetDTO.getAdamId() != null && !vppAssetDTO.getAdamId().isEmpty()) {
+                    stmt.setString(++x, vppAssetDTO.getAdamId());
+                }
+                if (vppAssetDTO.getAssignedCount() != null && !vppAssetDTO.getAssignedCount().isEmpty()) {
+                    stmt.setString(++x, vppAssetDTO.getAssignedCount());
+                }
+                if (vppAssetDTO.getDeviceAssignable() != null && !vppAssetDTO.getDeviceAssignable().isEmpty()) {
+                    stmt.setString(++x, vppAssetDTO.getDeviceAssignable());
+                }
+                if (vppAssetDTO.getPricingParam() != null && !vppAssetDTO.getPricingParam().isEmpty()) {
+                    stmt.setString(++x, vppAssetDTO.getPricingParam());
+                }
+                if (vppAssetDTO.getProductType() != null && !vppAssetDTO.getProductType().isEmpty()) {
+                    stmt.setString(++x, vppAssetDTO.getProductType());
+                }
+                if (vppAssetDTO.getRetiredCount() != null && !vppAssetDTO.getRetiredCount().isEmpty()) {
+                    stmt.setString(++x, vppAssetDTO.getRetiredCount());
+                }
+                if (vppAssetDTO.getRevocable() != null && !vppAssetDTO.getRevocable().isEmpty()) {
+                    stmt.setString(++x, vppAssetDTO.getRevocable());
+                }
+                if (vppAssetDTO.getSupportedPlatforms() != null && !vppAssetDTO.getSupportedPlatforms().isEmpty()) {
+                    List<String> platformList =  vppAssetDTO.getSupportedPlatforms();
+                    String platformString = String.join(",", platformList);
+                    stmt.setString(++x, platformString);
+                }
+
+                stmt.setInt(++x, vppAssetDTO.getAppId());
+                stmt.setLong(++x, updatedTime);
+                stmt.setInt(++x, vppAssetDTO.getId());
+                stmt.setLong(++x, tenantId);
+                if (stmt.executeUpdate() == 1) {
+                    return vppAssetDTO;
+                }
+                return null;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when updating the vpp user";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to updating the vpp user.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public VppAssociationDTO getAssociation(int assetId, int userId, int tenantId)
+            throws ApplicationManagementDAOException {
+        String sql = "SELECT "
+                + "ID, "
+                + "ASSOCIATION_TYPE, "
+                + "CREATED_TIME, "
+                + "LAST_UPDATED_TIME, "
+                + "PRICING_PARAMS "
+                + "FROM AP_VPP_ASSOCIATION "
+                + "WHERE ASSET_ID = ? AND USER_ID = ? AND TENANT_ID = ?";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, assetId);
+                stmt.setInt(2, userId);
+                stmt.setInt(3, tenantId);
+                try (ResultSet rs = stmt.executeQuery()) {
+                    return DAOUtil.loadAssignment(rs);
+                }
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when retrieving assignment data of user with id "+ userId;
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to retrieve assignment by asset id and user id.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }  catch (UnexpectedServerErrorException e) {
+            String msg = "Found more than one assignment for user id: " + userId + " and asset id: " + assetId;
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public int addAssociation(VppAssociationDTO vppAssociationDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+        int associationId = -1;
+        String sql = "INSERT INTO "
+                + "AP_VPP_ASSOCIATION("
+                + "ASSET_ID, "
+                + "USER_ID, "
+                + "TENANT_ID, "
+                + "ASSOCIATION_TYPE,"
+                + "CREATED_TIME,"
+                + "LAST_UPDATED_TIME,"
+                + "PRICING_PARAMS) "
+                + "VALUES (?, ?, ?, ?, ?)";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+                long currentTime = System.currentTimeMillis();
+                stmt.setInt(1, vppAssociationDTO.getAssetId());
+                stmt.setInt(2, vppAssociationDTO.getClientId());
+                stmt.setInt(3, tenantId);
+                stmt.setString(4, vppAssociationDTO.getAssociationType());
+                stmt.setLong(5, currentTime);
+                stmt.setLong(6, currentTime);
+                stmt.setString(7, vppAssociationDTO.getPricingParam());
+                stmt.executeUpdate();
+                try (ResultSet rs = stmt.getGeneratedKeys()) {
+                    if (rs.next()) {
+                        associationId = rs.getInt(1);
+                    }
+                }
+                return associationId;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when adding the asset.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to add the asset.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+
+    @Override
+    public VppAssociationDTO updateAssociation(VppAssociationDTO vppAssociationDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+
+        String sql = "UPDATE "
+                + "AP_VPP_ASSOCIATION "
+                + "SET "
+                + "ASSET_ID = ?,"
+                + "USER_ID = ?, "
+                + "ASSOCIATION_TYPE = ?, "
+                + "LAST_UPDATED_TIME = ?, "
+                + "PRICING_PARAMS = ? "
+                + "WHERE ID = ? AND TENANT_ID = ?";
+        try {
+            Connection conn = this.getDBConnection();
+            long updatedTime = System.currentTimeMillis();
+            try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+                stmt.setInt(1, vppAssociationDTO.getAssetId());
+                stmt.setInt(2, vppAssociationDTO.getClientId());
+                stmt.setString(3, vppAssociationDTO.getAssociationType());
+                stmt.setLong(4, updatedTime);
+                stmt.setString(5, vppAssociationDTO.getPricingParam());
+                stmt.setInt(6, vppAssociationDTO.getId());
+                stmt.setLong(7, tenantId);
+                if (stmt.executeUpdate() == 1) {
+                    return vppAssociationDTO;
+                }
+                return null;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when updating the vpp user";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to updating the vpp user.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/impl/vpp/OracleVppApplicationDAOImpl.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.exception.DBConnectionException;
+import io.entgra.device.mgt.core.application.mgt.core.exception.ApplicationManagementDAOException;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import java.sql.*;
+
+public class OracleVppApplicationDAOImpl extends GenericVppApplicationDAOImpl  {
+
+    private static final Log log = LogFactory.getLog(GenericVppApplicationDAOImpl.class);
+
+    @Override
+    public int addVppUser(VppUserDTO userDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+        int vppUserId = -1;
+        String sql = "INSERT INTO "
+                + "AP_VPP_USER("
+                + "CLIENT_USER_ID, "
+                + "DM_USERNAME, "
+                + "TENANT_ID, "
+                + "EMAIL, "
+                + "INVITE_CODE, "
+                + "STATUS,"
+                + "CREATED_TIME,"
+                + "LAST_UPDATED_TIME,"
+                + "MANAGED_ID,"
+                + "TEMP_PASSWORD) "
+                + "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql, new String[] {"ID"})) {
+                long currentTime = System.currentTimeMillis();
+                stmt.setString(1, userDTO.getClientUserId());
+                stmt.setString(2, userDTO.getDmUsername());
+                stmt.setInt(3, tenantId);
+                stmt.setString(4, userDTO.getEmail());
+                stmt.setString(5, userDTO.getInviteCode());
+                stmt.setString(6, userDTO.getStatus());
+                stmt.setLong(7, currentTime);
+                stmt.setLong(8, currentTime);
+                stmt.setString(9, userDTO.getManagedId());
+                stmt.setString(10, userDTO.getTmpPassword());
+                stmt.executeUpdate();
+                try (ResultSet rs = stmt.getGeneratedKeys()) {
+                    if (rs.next()) {
+                        vppUserId = rs.getInt(1);
+                    }
+                }
+                return vppUserId;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when adding the vpp user";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to add  the vpp user.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/impl/vpp/PostgreSQLVppApplicationDAO.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp;
+
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.exception.DBConnectionException;
+import io.entgra.device.mgt.core.application.mgt.core.exception.ApplicationManagementDAOException;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import java.sql.*;
+
+public class PostgreSQLVppApplicationDAO extends GenericVppApplicationDAOImpl {
+
+    private static final Log log = LogFactory.getLog(GenericVppApplicationDAOImpl.class);
+
+    public int addVppUser(VppUserDTO userDTO, int tenantId)
+            throws ApplicationManagementDAOException {
+        int vppUserId = -1;
+        String sql = "INSERT INTO "
+                + "AP_VPP_USER("
+                + "CLIENT_USER_ID, "
+                + "DM_USERNAME, "
+                + "TENANT_ID, "
+                + "EMAIL, "
+                + "INVITE_CODE, "
+                + "STATUS,"
+                + "CREATED_TIME,"
+                + "LAST_UPDATED_TIME,"
+                + "MANAGED_ID,"
+                + "TEMP_PASSWORD) "
+                + "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
+        try {
+            Connection conn = this.getDBConnection();
+            try (PreparedStatement stmt = conn.prepareStatement(sql, new String[]{"ID"})) {
+                long currentTime = System.currentTimeMillis();
+                stmt.setString(1, userDTO.getClientUserId());
+                stmt.setString(2, userDTO.getDmUsername());
+                stmt.setInt(3, tenantId);
+                stmt.setString(4, userDTO.getEmail());
+                stmt.setString(5, userDTO.getInviteCode());
+                stmt.setString(6, userDTO.getStatus());
+                stmt.setLong(7, currentTime);
+                stmt.setLong(8, currentTime);
+                stmt.setString(9, userDTO.getManagedId());
+                stmt.setString(10, userDTO.getTmpPassword());
+                stmt.executeUpdate();
+                try (ResultSet rs = stmt.getGeneratedKeys()) {
+                    if (rs.next()) {
+                        vppUserId = rs.getInt(1);
+                    }
+                }
+                return vppUserId;
+            }
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while obtaining database connection when adding the vpp user";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        } catch (SQLException e) {
+            String msg = "Error occurred when processing SQL to add  the vpp user.";
+            log.error(msg, e);
+            throw new ApplicationManagementDAOException(msg, e);
+        }
+    }
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/dao/impl/vpp/SQLServerVppApplicationDAOImpl.java

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.core.dao.impl.vpp;
+
+public class SQLServerVppApplicationDAOImpl extends GenericVppApplicationDAOImpl {
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/impl/ApplicationManagerImpl.java

@@ -22,6 +22,7 @@ import io.entgra.device.mgt.core.application.mgt.core.exception.BadRequestExcept
 import io.entgra.device.mgt.core.device.mgt.common.Base64File;
 import io.entgra.device.mgt.core.application.mgt.core.dao.SPApplicationDAO;
 import io.entgra.device.mgt.core.application.mgt.core.util.ApplicationManagementUtil;
+import io.entgra.device.mgt.core.device.mgt.common.PaginationRequest;
 import io.entgra.device.mgt.core.device.mgt.common.exceptions.MetadataManagementException;
 import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.Metadata;
 import org.apache.commons.codec.digest.DigestUtils;
@@ -1444,6 +1445,43 @@ public class ApplicationManagerImpl implements ApplicationManager {
         }
     }
 
+    @Override
+    public  ApplicationList getSubscribedAppsOfDevice(int deviceId, PaginationRequest request) throws ApplicationManagementException {
+        ApplicationList applicationList = new ApplicationList();
+        List<Application> applications = new ArrayList<>();
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        try {
+            ConnectionManagerUtil.openDBConnection();
+            List<ApplicationDTO>  applicationDTOS = this.applicationDAO.getSubscribedAppsOfDevice(deviceId, tenantId, request);
+            for (ApplicationDTO applicationDTO: applicationDTOS) {
+                applicationDTO.setTags(this.applicationDAO.getAppTags(applicationDTO.getId(), tenantId));
+                applicationDTO.setAppCategories(this.applicationDAO.getAppCategories(applicationDTO.getId(), tenantId));
+                applications.add(APIUtil.appDtoToAppResponse(applicationDTO));
+            }
+
+            List<ApplicationDTO>  totalApplications = this.applicationDAO.getSubscribedAppsOfDevice(deviceId, tenantId, null);
+            Pagination pagination = new Pagination();
+            pagination.setCount(totalApplications.size());
+            pagination.setSize(applications.size());
+            pagination.setOffset(request.getStartIndex());
+            pagination.setLimit(request.getRowCount());
+            applicationList.setApplications(applications);
+            applicationList.setPagination(pagination);
+            return applicationList;
+        } catch (ApplicationManagementDAOException e) {
+            String msg = "Error occurred when getting installed apps of device with device id: "
+                    + deviceId;
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (DBConnectionException e) {
+            String msg = "DB Connection error occurred while getting  installed apps of device with device id: " + deviceId;
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } finally {
+            ConnectionManagerUtil.closeDBConnection();
+        }
+    }
+
     /**
      * Check whether given OS range is valid or invalid
      *

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/impl/SubscriptionManagerImpl.java

@@ -19,8 +19,14 @@
 package io.entgra.device.mgt.core.application.mgt.core.impl;
 
 import com.google.gson.Gson;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.services.VPPApplicationManager;
+import io.entgra.device.mgt.core.application.mgt.core.dao.VppApplicationDAO;
 import io.entgra.device.mgt.core.application.mgt.core.exception.BadRequestException;
 import io.entgra.device.mgt.core.device.mgt.core.DeviceManagementConstants;
+import io.entgra.device.mgt.core.application.mgt.core.exception.UnexpectedServerErrorException;
+import io.entgra.device.mgt.core.application.mgt.core.util.VppHttpUtil;
 import io.entgra.device.mgt.core.device.mgt.extensions.logger.spi.EntgraLogger;
 import io.entgra.device.mgt.core.notification.logger.AppInstallLogContext;
 import io.entgra.device.mgt.core.notification.logger.impl.EntgraAppInstallLoggerImpl;
@@ -119,12 +125,14 @@ public class SubscriptionManagerImpl implements SubscriptionManager {
     private static final EntgraLogger log = new EntgraAppInstallLoggerImpl(SubscriptionManagerImpl.class);
     private SubscriptionDAO subscriptionDAO;
     private ApplicationDAO applicationDAO;
+    private VppApplicationDAO vppApplicationDAO;
     private LifecycleStateManager lifecycleStateManager;
 
     public SubscriptionManagerImpl() {
         this.lifecycleStateManager = DataHolder.getInstance().getLifecycleStateManager();
         this.subscriptionDAO = ApplicationManagementDAOFactory.getSubscriptionDAO();
         this.applicationDAO = ApplicationManagementDAOFactory.getApplicationDAO();
+        this.vppApplicationDAO = ApplicationManagementDAOFactory.getVppApplicationDAO();
     }
 
     @Override
@@ -149,6 +157,7 @@ public class SubscriptionManagerImpl implements SubscriptionManager {
         ApplicationDTO applicationDTO = getApplicationDTO(applicationUUID);
         ApplicationSubscriptionInfo applicationSubscriptionInfo = getAppSubscriptionInfo(applicationDTO, subType,
                 params);
+        performExternalStoreSubscription(applicationDTO, applicationSubscriptionInfo);
         ApplicationInstallResponse applicationInstallResponse = performActionOnDevices(
                 applicationSubscriptionInfo.getAppSupportingDeviceTypeName(), applicationSubscriptionInfo.getDevices(),
                 applicationDTO, subType, applicationSubscriptionInfo.getSubscribers(), action, properties, isOperationReExecutingDisabled);
@@ -157,6 +166,51 @@ public class SubscriptionManagerImpl implements SubscriptionManager {
         return applicationInstallResponse;
     }
 
+    private void performExternalStoreSubscription(ApplicationDTO applicationDTO,
+                                                  ApplicationSubscriptionInfo
+                                                          applicationSubscriptionInfo) throws ApplicationManagementException {
+        try {
+            // Only for iOS devices
+            int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+            if (DeviceTypes.IOS.toString().equalsIgnoreCase(APIUtil.getDeviceTypeData(applicationDTO
+                    .getDeviceTypeId()).getName())) {
+                // TODO: replace getAssetByAppId with the correct one in DAO
+                // Check if the app trying to subscribe is a VPP asset.
+                VppAssetDTO storedAsset = vppApplicationDAO.getAssetByAppId(applicationDTO.getId(), tenantId);
+                if (storedAsset != null) { // This is a VPP asset
+                    List<VppUserDTO> users = new ArrayList<>();
+                    List<Device> devices = applicationSubscriptionInfo.getDevices();// get
+                    // subscribed device list, so that we can extract the users of those devices.
+                    for (Device device : devices) {
+                        VppUserDTO user = vppApplicationDAO.getUserByDMUsername(device.getEnrolmentInfo()
+                                .getOwner(), PrivilegedCarbonContext.getThreadLocalCarbonContext()
+                                .getTenantId(true));
+                        users.add(user);
+                    }
+                    VPPApplicationManager vppManager = APIUtil.getVPPManager();
+                    vppManager.addAssociation(storedAsset, users);
+                }
+            }
+        } catch (BadRequestException e) {
+            String msg = "Device Type not found";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (UnexpectedServerErrorException e) {
+            String msg = "Unexpected error while getting device type";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (ApplicationManagementDAOException e) {
+            String msg = "Error while getting the device user";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (ApplicationManagementException e) {
+            String msg = "Error while associating user";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+
+    }
+
     @Override
     public void createScheduledSubscription(ScheduledSubscriptionDTO subscriptionDTO)
             throws SubscriptionManagementException {

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/impl/VppApplicationManagerImpl.java

@@ -0,0 +1,610 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.core.impl;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import io.entgra.device.mgt.core.application.mgt.common.DepConfig;
+import io.entgra.device.mgt.core.application.mgt.common.dto.ItuneAppDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.ProxyResponse;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssociationDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppItuneAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppItuneUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.response.Application;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import io.entgra.device.mgt.core.application.mgt.common.exception.ApplicationManagementException;
+import io.entgra.device.mgt.core.application.mgt.common.exception.DBConnectionException;
+import io.entgra.device.mgt.core.application.mgt.common.exception.TransactionManagementException;
+import io.entgra.device.mgt.core.application.mgt.common.services.VPPApplicationManager;
+import io.entgra.device.mgt.core.application.mgt.common.wrapper.VppAssociateRequestWrapper;
+import io.entgra.device.mgt.core.application.mgt.common.wrapper.VppItuneAssetResponseWrapper;
+import io.entgra.device.mgt.core.application.mgt.common.wrapper.VppItuneUserRequestWrapper;
+import io.entgra.device.mgt.core.application.mgt.common.wrapper.VppItuneUserResponseWrapper;
+import io.entgra.device.mgt.core.application.mgt.core.dao.ApplicationDAO;
+import io.entgra.device.mgt.core.application.mgt.core.dao.SPApplicationDAO;
+import io.entgra.device.mgt.core.application.mgt.core.dao.VisibilityDAO;
+import io.entgra.device.mgt.core.application.mgt.core.dao.VppApplicationDAO;
+import io.entgra.device.mgt.core.application.mgt.core.dao.common.ApplicationManagementDAOFactory;
+import io.entgra.device.mgt.core.application.mgt.core.exception.ApplicationManagementDAOException;
+import io.entgra.device.mgt.core.application.mgt.core.internal.DataHolder;
+import io.entgra.device.mgt.core.application.mgt.core.lifecycle.LifecycleStateManager;
+import io.entgra.device.mgt.core.application.mgt.core.util.ApplicationManagementUtil;
+import io.entgra.device.mgt.core.application.mgt.core.util.ConnectionManagerUtil;
+import io.entgra.device.mgt.core.application.mgt.core.util.Constants;
+import io.entgra.device.mgt.core.application.mgt.core.util.VppHttpUtil;
+import io.entgra.device.mgt.core.application.mgt.core.util.APIUtil;
+import io.entgra.device.mgt.core.device.mgt.common.exceptions.MetadataManagementException;
+import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.Metadata;
+import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.MetadataManagementService;
+import io.entgra.device.mgt.core.device.mgt.core.DeviceManagementConstants;
+import io.entgra.device.mgt.core.device.mgt.core.internal.DeviceManagementDataHolder;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.http.HttpStatus;
+import org.wso2.carbon.context.PrivilegedCarbonContext;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class VppApplicationManagerImpl implements VPPApplicationManager {
+    private static final String APP_API = "https://vpp.itunes.apple.com/mdm/v2";
+    private static final String ASSETS = APP_API + "/assets";
+    private static final String USER_CREATE = APP_API + "/users/create";
+    private static final String USER_UPDATE = APP_API + "/users/update";
+    private static final String USER_GET = APP_API + "/users";
+    private static final String ASSIGNMENTS_POST = APP_API + "/assets/associate";
+    private static final String ASSIGNMENTS_GET = APP_API + "/assignments";
+    private static final String TOKEN = "";
+    private static final String LOOKUP_API = "https://uclient-api.itunes.apple" +
+            ".com/WebObjects/MZStorePlatform.woa/wa/lookup?version=2&id=";
+    private static final String LOOKUP_API_PREFIX =
+            "&p=mdm-lockup&caller=MDM&platform=enterprisestore&cc=us&l=en";
+
+
+    private static final Log log = LogFactory.getLog(VppApplicationManagerImpl.class);
+
+    private ApplicationDAO applicationDAO;
+    private SPApplicationDAO spApplicationDAO;
+    private VisibilityDAO visibilityDAO;
+    private final LifecycleStateManager lifecycleStateManager;
+    private VppApplicationDAO vppApplicationDAO;
+
+    public VppApplicationManagerImpl() {
+        initDataAccessObjects();
+        lifecycleStateManager = DataHolder.getInstance().getLifecycleStateManager();
+    }
+
+    private void initDataAccessObjects() {
+        this.applicationDAO = ApplicationManagementDAOFactory.getApplicationDAO();
+        this.visibilityDAO = ApplicationManagementDAOFactory.getVisibilityDAO();
+        this.spApplicationDAO = ApplicationManagementDAOFactory.getSPApplicationDAO();
+        this.vppApplicationDAO = ApplicationManagementDAOFactory.getVppApplicationDAO();
+    }
+
+    @Override
+    public VppUserDTO addUser(VppUserDTO userDTO) throws ApplicationManagementException {
+
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+
+        // Call the API to add
+        try {
+            VppItuneUserDTO ituneUserDTO = userDTO;
+            VppItuneUserRequestWrapper wrapper = new VppItuneUserRequestWrapper();
+            wrapper.getUser().add(ituneUserDTO);
+
+            Gson gson = new Gson();
+            String userPayload = gson.toJson(wrapper);
+
+            ProxyResponse proxyResponse = callVPPBackend(USER_CREATE, userPayload, getVppToken(), Constants.VPP.POST);
+            if ((proxyResponse.getCode() == HttpStatus.SC_OK || proxyResponse.getCode() ==
+                    HttpStatus.SC_CREATED) && proxyResponse.getData().contains(Constants.VPP.EVENT_ID)) {
+                // Create user does not return any useful data. Its needed to call the backend again
+                ProxyResponse getUserResponse = callVPPBackend(USER_GET + Constants.VPP.CLIENT_USER_ID_PARAM +
+                                userDTO.getClientUserId(), userPayload, getVppToken(), Constants.VPP.GET);
+                if ((getUserResponse.getCode() == HttpStatus.SC_OK || getUserResponse.getCode() ==
+                        HttpStatus.SC_CREATED) && getUserResponse.getData().contains(Constants.VPP.TOTAL_PAGES)) {
+                    VppItuneUserResponseWrapper vppItuneUserResponseWrapper = gson.fromJson
+                            (getUserResponse.getData(), VppItuneUserResponseWrapper.class);
+                    userDTO.setInviteCode(vppItuneUserResponseWrapper.getUser().get(0)
+                            .getInviteCode());
+                    userDTO.setStatus(vppItuneUserResponseWrapper.getUser().get(0).getStatus());
+                    log.error("userDTO " + userDTO.toString());
+                    try {
+                        ConnectionManagerUtil.beginDBTransaction();
+                        int id = vppApplicationDAO.addVppUser(userDTO, tenantId);
+                        if (id != -1) {
+                            ConnectionManagerUtil.commitDBTransaction();
+                            userDTO.setId(id);
+                            userDTO.setTenantId(PrivilegedCarbonContext
+                                    .getThreadLocalCarbonContext().getTenantId());
+                            return userDTO;
+                        }
+                        ConnectionManagerUtil.rollbackDBTransaction();
+                        return null;
+                    } catch (ApplicationManagementDAOException e) {
+                        ConnectionManagerUtil.rollbackDBTransaction();
+                        String msg = "Error occurred while adding the Vpp User.";
+                        log.error(msg, e);
+                        throw new ApplicationManagementException(msg, e);
+                    } catch (TransactionManagementException e) {
+                        String msg = "Error occurred while executing database transaction for adding Vpp User.";
+                        log.error(msg, e);
+                        throw new ApplicationManagementException(msg, e);
+                    } catch (DBConnectionException e) {
+                        String msg = "Error occurred while retrieving the database connection for adding Vpp User.";
+                        log.error(msg, e);
+                        throw new ApplicationManagementException(msg, e);
+                    } finally {
+                        ConnectionManagerUtil.closeDBConnection();
+                    }
+                }
+
+            }
+        } catch (IOException e) {
+            String msg = "Error while calling VPP backend to add user";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+        return null;
+    }
+
+    @Override
+    public VppUserDTO getUserByDMUsername(String emmUsername) throws ApplicationManagementException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        try {
+            ConnectionManagerUtil.openDBConnection();
+            return vppApplicationDAO.getUserByDMUsername(emmUsername, tenantId);
+        } catch (DBConnectionException e) {
+            String msg = "DB Connection error occurs while getting vpp User data related to EMM user  " + emmUsername + ".";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }  catch (ApplicationManagementDAOException e) {
+            String msg = "Error occurred while getting vpp User data related to EMM user  " + emmUsername + ".";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } finally {
+            ConnectionManagerUtil.closeDBConnection();
+        }
+    }
+
+    @Override
+    public void updateUser(VppUserDTO userDTO) throws ApplicationManagementException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        VppItuneUserDTO ituneUserDTO = userDTO;
+        VppItuneUserRequestWrapper wrapper = new VppItuneUserRequestWrapper();
+        wrapper.getUser().add(ituneUserDTO);
+
+        Gson gson = new Gson();
+        String userPayload = gson.toJson(wrapper);
+        try {
+            ProxyResponse proxyResponse = callVPPBackend(USER_UPDATE, userPayload, getVppToken(), Constants.VPP.POST);
+            if ((proxyResponse.getCode() == HttpStatus.SC_OK || proxyResponse.getCode() ==
+                    HttpStatus.SC_CREATED) && proxyResponse.getData().contains(Constants.VPP.EVENT_ID)) {
+                    VppUserDTO currentUserDTO =  getUserByDMUsername(userDTO.getDmUsername());
+                    if (currentUserDTO != null) {
+                        userDTO.setId(currentUserDTO.getId());
+                    }
+                    try {
+                        ConnectionManagerUtil.beginDBTransaction();
+                        if (vppApplicationDAO.updateVppUser(userDTO, tenantId) == null) {
+                            ConnectionManagerUtil.rollbackDBTransaction();
+                            String msg = "Unable to update the Vpp user " +userDTO.getId();
+                            log.error(msg);
+                            throw new ApplicationManagementException(msg);
+                        }
+                        ConnectionManagerUtil.commitDBTransaction();
+                    } catch (ApplicationManagementDAOException e) {
+                        ConnectionManagerUtil.rollbackDBTransaction();
+                        String msg = "Error occurred while updating the Vpp User.";
+                        log.error(msg, e);
+                        throw new ApplicationManagementException(msg, e);
+                    } catch (TransactionManagementException e) {
+                        String msg = "Error occurred while executing database transaction for Vpp User update.";
+                        log.error(msg, e);
+                        throw new ApplicationManagementException(msg, e);
+                    } catch (DBConnectionException e) {
+                        String msg = "Error occurred while retrieving the database connection for Vpp User update.";
+                        log.error(msg, e);
+                        throw new ApplicationManagementException(msg, e);
+                    } finally {
+                        ConnectionManagerUtil.closeDBConnection();
+                    }
+                }
+
+        } catch (IOException e) {
+            String msg = "Error while calling VPP backend to update";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+    }
+
+    @Override
+    public void syncUsers(String clientId) throws ApplicationManagementException {
+        ProxyResponse proxyResponse = null;
+        try {
+            proxyResponse = callVPPBackend(USER_GET, null, getVppToken(), Constants
+                    .VPP.GET);
+            if ((proxyResponse.getCode() == HttpStatus.SC_OK || proxyResponse.getCode() ==
+                    HttpStatus.SC_CREATED) && proxyResponse.getData().contains(Constants.VPP.TOTAL_PAGES)) {
+                log.error("proxyResponse " + proxyResponse.getData());
+                Gson gson = new Gson();
+                VppItuneUserResponseWrapper vppUserResponseWrapper = gson.fromJson
+                        (proxyResponse.getData(), VppItuneUserResponseWrapper.class);
+                // TODO: to implement later
+            }
+        } catch (IOException e) {
+            String msg = "Error while syncing VPP users with backend";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+
+    }
+
+    @Override
+    public void syncAssets(int nextPageIndex) throws ApplicationManagementException {
+        ProxyResponse proxyResponse = null;
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        try {
+            String url = ASSETS;
+            if (nextPageIndex > 0) { // Not the first page
+                url += "?pageIndex=" + nextPageIndex;
+            }
+            proxyResponse = callVPPBackend(url, null, getVppToken(), Constants.VPP.GET);
+            if ((proxyResponse.getCode() == HttpStatus.SC_OK || proxyResponse.getCode() ==
+                    HttpStatus.SC_CREATED) && proxyResponse.getData().contains(Constants.VPP.TOTAL_PAGES)) {
+                Gson gson = new Gson();
+                VppItuneAssetResponseWrapper vppItuneAssetResponse = gson.fromJson
+                        (proxyResponse.getData(), VppItuneAssetResponseWrapper.class);
+                if (vppItuneAssetResponse.getSize() > 0) {
+                    for (VppAssetDTO vppAssetDTO : vppItuneAssetResponse.getAssets()) {
+                        vppAssetDTO.setTenantId(PrivilegedCarbonContext
+                                .getThreadLocalCarbonContext().getTenantId());
+                        vppAssetDTO.setCreatedTime(String.valueOf(System.currentTimeMillis()));
+                        vppAssetDTO.setLastUpdatedTime(String.valueOf(System.currentTimeMillis()));
+                    }
+
+                    for (VppAssetDTO vppAssetDTO : vppItuneAssetResponse.getAssets()) {
+                        ItuneAppDTO ituneAppDTO = lookupAsset(vppAssetDTO.getAdamId());
+                        ApplicationManagementUtil.persistApp(ituneAppDTO);
+                        List<Application> applications =  ApplicationManagementUtil.getAppDetails(vppAssetDTO.getAdamId());
+                        for (Application application :applications) {
+                            VppAssetDTO vppAssetDTOs = getAssetByAppId(application.getId());
+                            if (vppAssetDTOs == null) {
+                                vppAssetDTOs = new VppAssetDTO();
+                                vppAssetDTO.setAppId(application.getId());
+                                try {
+                                    ConnectionManagerUtil.beginDBTransaction();
+                                    if (vppApplicationDAO.addAsset(vppAssetDTO, tenantId) != -1) {
+                                        ConnectionManagerUtil.commitDBTransaction();
+                                    }
+                                    ConnectionManagerUtil.rollbackDBTransaction();
+                                } catch (ApplicationManagementDAOException e) {
+                                    ConnectionManagerUtil.rollbackDBTransaction();
+                                    String msg = "Error occurred while adding the Asset.";
+                                    log.error(msg, e);
+                                    throw new ApplicationManagementException(msg, e);
+                                } catch (TransactionManagementException e) {
+                                    String msg = "Error occurred while executing database transaction for adding Asset.";
+                                    log.error(msg, e);
+                                    throw new ApplicationManagementException(msg, e);
+                                } catch (DBConnectionException e) {
+                                    String msg = "Error occurred while retrieving the database connection for adding Asset.";
+                                    log.error(msg, e);
+                                    throw new ApplicationManagementException(msg, e);
+                                } finally {
+                                    ConnectionManagerUtil.closeDBConnection();
+                                }
+                            } else {
+                                vppAssetDTOs.setAppId(application.getId());
+                                vppAssetDTOs.setSupportedPlatforms(vppAssetDTO.getSupportedPlatforms());
+                                try {
+                                    ConnectionManagerUtil.beginDBTransaction();
+                                    if (vppApplicationDAO.updateAsset(vppAssetDTOs, tenantId) == null) {
+                                        ConnectionManagerUtil.rollbackDBTransaction();
+                                        String msg = "Unable to update the asset: " +vppAssetDTOs.getAdamId();
+                                        log.error(msg);
+                                        throw new ApplicationManagementException(msg);
+                                    }
+                                    ConnectionManagerUtil.commitDBTransaction();
+                                } catch (ApplicationManagementDAOException e) {
+                                    ConnectionManagerUtil.rollbackDBTransaction();
+                                    String msg = "Error occurred while updating the Asset.";
+                                    log.error(msg, e);
+                                    throw new ApplicationManagementException(msg, e);
+                                } catch (TransactionManagementException e) {
+                                    String msg = "Error occurred while executing database transaction for Asset update.";
+                                    log.error(msg, e);
+                                    throw new ApplicationManagementException(msg, e);
+                                } catch (DBConnectionException e) {
+                                    String msg = "Error occurred while retrieving the database connection for Asset update.";
+                                    log.error(msg, e);
+                                    throw new ApplicationManagementException(msg, e);
+                                } finally {
+                                    ConnectionManagerUtil.closeDBConnection();
+                                }
+                            }
+                        }
+                    }
+                }
+
+                if (vppItuneAssetResponse.getCurrentPageIndex() == (vppItuneAssetResponse
+                        .getTotalPages() - 1)) {
+                    return;
+                } else {
+                    syncAssets(vppItuneAssetResponse.getNextPageIndex());
+                }
+            }
+        } catch (IOException e) {
+            String msg = "Error while syncing VPP users with backend";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+    }
+
+    private ItuneAppDTO lookupAsset(String packageName) throws ApplicationManagementException {
+        String lookupURL = LOOKUP_API + packageName + LOOKUP_API_PREFIX;
+        try {
+            ProxyResponse proxyResponse = callVPPBackend(lookupURL, null, getVppToken(), Constants.VPP.GET);
+            if ((proxyResponse.getCode() == HttpStatus.SC_OK || proxyResponse.getCode() ==
+                    HttpStatus.SC_CREATED) && proxyResponse.getData().contains(Constants.VPP.GET_APP_DATA_RESPONSE_START)) {
+                String responseData = proxyResponse.getData();
+                JsonObject responseJson = new JsonParser().parse(responseData)
+                        .getAsJsonObject();
+
+                JsonObject results = responseJson.getAsJsonObject(Constants.ApplicationProperties.RESULTS);
+                JsonObject result = results.getAsJsonObject(packageName);
+
+                String iconUrl = result.getAsJsonObject(Constants.ApplicationProperties.ARTWORK)
+                        .get(Constants.ApplicationProperties.URL).getAsString();
+                int lastSlashIndex = iconUrl.lastIndexOf("/");
+                if (lastSlashIndex != -1) {
+                    iconUrl = iconUrl.substring(0, lastSlashIndex + 1) + Constants.VPP.REMOTE_FILE_NAME;
+                }
+
+                String descriptionStandard = result.getAsJsonObject(Constants.ApplicationProperties.DESCRIPTION)
+                        .get(Constants.ApplicationProperties.STANDARD).getAsString();
+                if (descriptionStandard != null && !descriptionStandard.isEmpty()) {
+                    descriptionStandard = descriptionStandard.substring(0, 199);
+                }
+                String name = result.get(Constants.ApplicationProperties.NAME).getAsString();
+                double price = result.getAsJsonArray(Constants.ApplicationProperties.OFFERS).get(0)
+                        .getAsJsonObject().get(Constants.ApplicationProperties.PRICE).getAsDouble();
+                String version = result.getAsJsonArray(Constants.ApplicationProperties.OFFERS)
+                        .get(0).getAsJsonObject().get(Constants.ApplicationProperties.VERSION)
+                        .getAsJsonObject().get(Constants.ApplicationProperties.DISPLAY).getAsString();
+
+                String[] genreNames = new Gson().fromJson(result.getAsJsonArray(Constants.ApplicationProperties.GENRE_NAMES),
+                        String[].class);
+
+                ItuneAppDTO ituneAppDTO = new ItuneAppDTO();
+                ituneAppDTO.setPackageName(packageName);
+                ituneAppDTO.setVersion(version);
+                ituneAppDTO.setDescription(descriptionStandard);
+                ituneAppDTO.setTitle(name);
+
+                if (Constants.ApplicationProperties.PRICE_ZERO.equalsIgnoreCase(String.valueOf(price))) {
+                    ituneAppDTO.setPaymentMethod(Constants.ApplicationProperties.FREE_SUB_METHOD);
+                } else {
+                    ituneAppDTO.setPaymentMethod(Constants.ApplicationProperties.PAID_SUB_METHOD);
+                }
+                ituneAppDTO.setIconURL(iconUrl);
+                ituneAppDTO.setCategory(genreNames[0]);
+
+                return ituneAppDTO;
+            }
+        } catch (IOException e) {
+            String msg = "Error while looking up the app details";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+        return null;
+    }
+
+    @Override
+    public VppAssetDTO getAssetByAppId(int appId) throws ApplicationManagementException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        try {
+            ConnectionManagerUtil.openDBConnection();
+            return vppApplicationDAO.getAssetByAppId(appId, tenantId);
+        } catch (DBConnectionException e) {
+            String msg = "DB Connection error occurs while getting asset related to app with app id " + appId + ".";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }  catch (ApplicationManagementDAOException e) {
+            String msg = "Error occurred while getting asset data related to  app with app id " + appId + ".";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } finally {
+            ConnectionManagerUtil.closeDBConnection();
+        }
+    }
+
+    @Override
+    public boolean addAssociation(VppAssetDTO asset, List<VppUserDTO> vppUsers) throws
+            ApplicationManagementException {
+
+        List<VppAssociationDTO> associations = new ArrayList<>(); // To save to UEM DBs
+        List<String> clientUserIds = new ArrayList<>(); // Need this to send to vpp backend.
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        if (asset != null) {
+            for (VppUserDTO vppUserDTO : vppUsers) {
+                VppAssociationDTO associationDTO = VppHttpUtil.getAssociation(vppUserDTO, asset);
+                associations.add(associationDTO);
+                clientUserIds.add(vppUserDTO.getClientUserId());
+            }
+
+            if (associations.size() > 0) {
+                //TODO: Add or Update associations
+                try {
+
+                    // Create the VPP backend payload
+                    List<VppItuneAssetDTO> assets = new ArrayList<>();
+                    VppItuneAssetDTO assetDTO = new VppItuneAssetDTO();
+                    assetDTO.setAdamId(asset.getAdamId());
+                    assetDTO.setPricingParam(asset.getPricingParam());
+                    assets.add(assetDTO);
+
+                    VppAssociateRequestWrapper vppAssociate = new VppAssociateRequestWrapper();
+                    vppAssociate.setAssets(assets);
+                    vppAssociate.setClientUserIds(clientUserIds);
+
+                    Gson gson = new Gson();
+                    String payload = gson.toJson(vppAssociate);
+
+                    ProxyResponse proxyResponse = callVPPBackend(ASSIGNMENTS_POST, payload, getVppToken(),
+                            Constants.VPP.POST);
+                    if ((proxyResponse.getCode() == HttpStatus.SC_OK || proxyResponse.getCode() ==
+                            HttpStatus.SC_CREATED) && proxyResponse.getData().contains(Constants.VPP.EVENT_ID)) {
+                        // Create assignment does not return any useful data. Its needed to call the backend again
+                        ProxyResponse getAssignmentResponse = callVPPBackend(ASSIGNMENTS_GET, null, getVppToken(), Constants.VPP.GET);
+                        if ((getAssignmentResponse.getCode() == HttpStatus.SC_OK || getAssignmentResponse.getCode() ==
+                                HttpStatus.SC_CREATED) && getAssignmentResponse.getData().contains(Constants.VPP.TOTAL_PAGES)) {
+//                            VppAssociateResponseWrapper vppAssociateResponseWrapper = gson.fromJson
+//                                    (getAssignmentResponse.getData(), VppAssociateResponseWrapper.class);
+                            for (VppAssociationDTO association : associations) {
+
+                                VppAssociationDTO vppAssociation =  getAssociation(association.getAssetId(), association.getClientId());
+
+                                if (vppAssociation == null) {
+                                    try {
+                                        ConnectionManagerUtil.beginDBTransaction();
+                                        if (vppApplicationDAO.addAssociation(association, tenantId) != -1) {
+                                            ConnectionManagerUtil.commitDBTransaction();
+                                            return true;
+                                        }
+                                        ConnectionManagerUtil.rollbackDBTransaction();
+                                        return false;
+                                    } catch (ApplicationManagementDAOException e) {
+                                        ConnectionManagerUtil.rollbackDBTransaction();
+                                        String msg = "Error occurred while adding the Assignment.";
+                                        log.error(msg, e);
+                                        throw new ApplicationManagementException(msg, e);
+                                    } catch (TransactionManagementException e) {
+                                        String msg = "Error occurred while executing database transaction for adding Assignment.";
+                                        log.error(msg, e);
+                                        throw new ApplicationManagementException(msg, e);
+                                    } catch (DBConnectionException e) {
+                                        String msg = "Error occurred while retrieving the database connection for adding Assignment.";
+                                        log.error(msg, e);
+                                        throw new ApplicationManagementException(msg, e);
+                                    } finally {
+                                        ConnectionManagerUtil.closeDBConnection();
+                                    }
+                                } else {
+                                    try {
+                                        ConnectionManagerUtil.beginDBTransaction();
+                                        if (vppApplicationDAO.updateAssociation(association, tenantId) == null) {
+                                            ConnectionManagerUtil.rollbackDBTransaction();
+                                            String msg = "Unable to update the assignment: " +association.getAssetId();
+                                            log.error(msg);
+                                            throw new ApplicationManagementException(msg);
+                                        }
+                                        ConnectionManagerUtil.commitDBTransaction();
+                                        return true;
+                                    } catch (ApplicationManagementDAOException e) {
+                                        ConnectionManagerUtil.rollbackDBTransaction();
+                                        String msg = "Error occurred while updating the Asset.";
+                                        log.error(msg, e);
+                                        throw new ApplicationManagementException(msg, e);
+                                    } catch (TransactionManagementException e) {
+                                        String msg = "Error occurred while executing database transaction for Asset update.";
+                                        log.error(msg, e);
+                                        throw new ApplicationManagementException(msg, e);
+                                    } catch (DBConnectionException e) {
+                                        String msg = "Error occurred while retrieving the database connection for Asset update.";
+                                        log.error(msg, e);
+                                        throw new ApplicationManagementException(msg, e);
+                                    } finally {
+                                        ConnectionManagerUtil.closeDBConnection();
+                                    }
+                                }
+                            }
+                        }
+
+                    }
+
+                } catch (IOException e) {
+                    String msg = "Error while adding associations";
+                    log.error(msg, e);
+                    throw new ApplicationManagementException(msg, e);
+                }
+            }
+
+        }
+
+        return false;
+    }
+
+    @Override
+    public VppAssociationDTO getAssociation(int assetId, int userId) throws ApplicationManagementException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        try {
+            ConnectionManagerUtil.openDBConnection();
+            return vppApplicationDAO.getAssociation(assetId, userId, tenantId);
+        } catch (DBConnectionException e) {
+            String msg = "DB Connection error occurs while getting assignment related to user of id " + userId + ".";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }  catch (ApplicationManagementDAOException e) {
+            String msg = "Error occurred while getting assignment data related to user of id " + userId + ".";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } finally {
+            ConnectionManagerUtil.closeDBConnection();
+        }
+    }
+
+    @Override
+    public ProxyResponse callVPPBackend(String url,
+                                        String payload,
+                                        String accessToken,
+                                        String method) throws IOException {
+        return VppHttpUtil.execute(url, payload, accessToken, method);
+    }
+
+    public String getVppToken() throws ApplicationManagementException {
+        String token = "";
+        MetadataManagementService meta = APIUtil.getMetadataManager();
+        Metadata metadata = null;
+        try {
+            metadata = meta.retrieveMetadata("DEP_META_KEY");
+            if (metadata != null) {
+
+                Gson g = new Gson();
+                DepConfig depConfigs = g.fromJson(metadata.getMetaValue(), DepConfig.class);
+                token =  depConfigs.getVppToken();
+                return token;
+            }
+        }catch (MetadataManagementException e) {
+            String msg = "Error when retrieving metadata of vpp feature";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+        return token;
+    }
+
+    public VppAssociationDTO getUserAssociation(String adamId, String emmUsername) throws ApplicationManagementException {
+        // Todo: Join the 3 tables and find a matching association
+        return null;
+    }
+
+}

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/internal/ApplicationManagementServiceComponent.java

@@ -17,24 +17,25 @@
  */
 package io.entgra.device.mgt.core.application.mgt.core.internal;
 
-import io.entgra.device.mgt.core.application.mgt.common.services.SPApplicationManager;
-import io.entgra.device.mgt.core.application.mgt.core.impl.AppmDataHandlerImpl;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.osgi.framework.BundleContext;
-import org.osgi.service.component.ComponentContext;
 import io.entgra.device.mgt.core.application.mgt.common.config.LifecycleState;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationStorageManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.AppmDataHandler;
 import io.entgra.device.mgt.core.application.mgt.common.services.ReviewManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.SPApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SubscriptionManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.VPPApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.core.config.ConfigurationManager;
 import io.entgra.device.mgt.core.application.mgt.core.dao.common.ApplicationManagementDAOFactory;
+import io.entgra.device.mgt.core.application.mgt.core.impl.AppmDataHandlerImpl;
 import io.entgra.device.mgt.core.application.mgt.core.lifecycle.LifecycleStateManager;
 import io.entgra.device.mgt.core.application.mgt.core.task.ScheduledAppSubscriptionTaskManager;
 import io.entgra.device.mgt.core.application.mgt.core.util.ApplicationManagementUtil;
 import io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProviderService;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.osgi.framework.BundleContext;
+import org.osgi.service.component.ComponentContext;
 import org.wso2.carbon.ndatasource.core.DataSourceService;
 import org.wso2.carbon.ntask.core.service.TaskService;
 import org.wso2.carbon.user.core.service.RealmService;
@@ -116,6 +117,12 @@ public class ApplicationManagementServiceComponent {
             DataHolder.getInstance().setConfigManager(configManager);
             bundleContext.registerService(AppmDataHandler.class.getName(), configManager, null);
 
+            // TODO: Get the new instance from extension like others
+            VPPApplicationManager vppApplicationManager = ApplicationManagementUtil
+                    .getVPPManagerInstance();
+            DataHolder.getInstance().setVppApplicationManager(vppApplicationManager);
+            bundleContext.registerService(VPPApplicationManager.class.getName(), vppApplicationManager, null);
+
             ScheduledAppSubscriptionTaskManager taskManager = new ScheduledAppSubscriptionTaskManager();
             taskManager.scheduleCleanupTask();
 

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/internal/DataHolder.java

@@ -23,6 +23,7 @@ import io.entgra.device.mgt.core.application.mgt.common.services.AppmDataHandler
 import io.entgra.device.mgt.core.application.mgt.common.services.SPApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.ReviewManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SubscriptionManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.VPPApplicationManager;
 import io.entgra.device.mgt.core.application.mgt.core.lifecycle.LifecycleStateManager;
 import io.entgra.device.mgt.core.device.mgt.core.service.DeviceManagementProviderService;
 import org.wso2.carbon.ntask.core.service.TaskService;
@@ -39,6 +40,8 @@ public class DataHolder {
 
     private SPApplicationManager SPApplicationManager;
 
+    private VPPApplicationManager vppApplicationManager;
+
     private ApplicationManager applicationManager;
 
     private ReviewManager reviewManager;
@@ -142,4 +145,12 @@ public class DataHolder {
     public void setISApplicationManager(SPApplicationManager SPApplicationManager) {
         this.SPApplicationManager = SPApplicationManager;
     }
+
+    public VPPApplicationManager getVppApplicationManager() {
+        return vppApplicationManager;
+    }
+
+    public void setVppApplicationManager(VPPApplicationManager vppApplicationManager) {
+        this.vppApplicationManager = vppApplicationManager;
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/APIUtil.java

@@ -72,6 +72,7 @@ public class APIUtil {
     private static volatile SubscriptionManager subscriptionManager;
     private static volatile ReviewManager reviewManager;
     private static volatile AppmDataHandler appmDataHandler;
+    private static volatile VPPApplicationManager vppApplicationManager;
     private static volatile MetadataManagementService metadataManagementService;
 
     public static SPApplicationManager getSPApplicationManager() {
@@ -114,6 +115,24 @@ public class APIUtil {
         return applicationManager;
     }
 
+    public static MetadataManagementService getMetadataManager() {
+        if (metadataManagementService == null) {
+            synchronized (APIUtil.class) {
+                if (metadataManagementService == null) {
+                    PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+                    metadataManagementService =
+                            (MetadataManagementService) ctx.getOSGiService(MetadataManagementService.class, null);
+                    if (metadataManagementService == null) {
+                        String msg = "MetadataManagement Manager service has not initialized.";
+                        log.error(msg);
+                        throw new IllegalStateException(msg);
+                    }
+                }
+            }
+        }
+        return metadataManagementService;
+    }
+
     /**
      * To get the ApplicationDTO Storage Manager from the osgi context.
      * @return ApplicationStoreManager instance in the current osgi context.
@@ -202,6 +221,29 @@ public class APIUtil {
         return reviewManager;
     }
 
+    public static VPPApplicationManager getVPPManager() {
+        try {
+            if (vppApplicationManager == null) {
+                synchronized (APIUtil.class) {
+                    if (vppApplicationManager == null) {
+                        vppApplicationManager = ApplicationManagementUtil.getVPPManagerInstance();
+                        if (vppApplicationManager == null) {
+                            String msg = "Vpp Manager service has not initialized.";
+                            log.error(msg);
+                            throw new IllegalStateException(msg);
+                        }
+                    }
+                }
+            }
+        } catch (Exception e) {
+            String msg = "Error occurred while getting the vpp manager";
+            log.error(msg);
+            throw new IllegalStateException(msg);
+        }
+        return vppApplicationManager;
+    }
+
+
     /**
      * To get the DataHandler from the osgi context.
      * @return AppmDataHandler instance in the current osgi context.
@@ -426,9 +468,13 @@ public class APIUtil {
         }
         List<ApplicationRelease> applicationReleases = new ArrayList<>();
         if (ApplicationType.PUBLIC.toString().equals(applicationDTO.getType()) && application.getCategories()
-                .contains("GooglePlaySyncedApp")) {
+                .contains(Constants.GOOGLE_PLAY_SYNCED_APP)) {
             application.setAndroidEnterpriseApp(true);
         }
+        if (ApplicationType.PUBLIC.toString().equals(applicationDTO.getType()) && application.getCategories()
+                .contains(Constants.ApplicationProperties.APPLE_STORE_SYNCED_APP_CATEGORY)) {
+            application.setExternalAppStoreApp(true);
+        }
         for (ApplicationReleaseDTO applicationReleaseDTO : applicationDTO.getApplicationReleaseDTOs()) {
             applicationReleases.add(releaseDtoToRelease(applicationReleaseDTO));
         }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/ApplicationManagementUtil.java

@@ -18,15 +18,22 @@
 package io.entgra.device.mgt.core.application.mgt.core.util;
 
 import io.entgra.device.mgt.core.application.mgt.common.ApplicationArtifact;
-import io.entgra.device.mgt.core.application.mgt.core.config.ConfigurationManager;
-import io.entgra.device.mgt.core.application.mgt.core.config.Extension;
-import io.entgra.device.mgt.core.application.mgt.core.exception.BadRequestException;
-import io.entgra.device.mgt.core.device.mgt.common.Base64File;
 import io.entgra.device.mgt.core.application.mgt.common.FileDataHolder;
+import io.entgra.device.mgt.core.application.mgt.common.LifecycleChanger;
 import io.entgra.device.mgt.core.application.mgt.common.dto.ApplicationDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.ItuneAppDTO;
 import io.entgra.device.mgt.core.application.mgt.common.exception.ApplicationManagementException;
+import io.entgra.device.mgt.core.application.mgt.common.exception.InvalidConfigurationException;
 import io.entgra.device.mgt.core.application.mgt.common.exception.RequestValidatingException;
+import io.entgra.device.mgt.core.application.mgt.common.response.Application;
+import io.entgra.device.mgt.core.application.mgt.common.response.Category;
+import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationStorageManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.ReviewManager;
 import io.entgra.device.mgt.core.application.mgt.common.services.SPApplicationManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.SubscriptionManager;
+import io.entgra.device.mgt.core.application.mgt.common.services.VPPApplicationManager;
+import io.entgra.device.mgt.core.application.mgt.common.wrapper.ApplicationUpdateWrapper;
 import io.entgra.device.mgt.core.application.mgt.common.wrapper.ApplicationWrapper;
 import io.entgra.device.mgt.core.application.mgt.common.wrapper.CustomAppReleaseWrapper;
 import io.entgra.device.mgt.core.application.mgt.common.wrapper.CustomAppWrapper;
@@ -35,18 +42,34 @@ import io.entgra.device.mgt.core.application.mgt.common.wrapper.PublicAppRelease
 import io.entgra.device.mgt.core.application.mgt.common.wrapper.PublicAppWrapper;
 import io.entgra.device.mgt.core.application.mgt.common.wrapper.WebAppReleaseWrapper;
 import io.entgra.device.mgt.core.application.mgt.common.wrapper.WebAppWrapper;
-import org.apache.commons.logging.Log;
+import io.entgra.device.mgt.core.application.mgt.core.config.ConfigurationManager;
-import org.apache.commons.logging.LogFactory;
+import io.entgra.device.mgt.core.application.mgt.core.config.Extension;
-import io.entgra.device.mgt.core.application.mgt.common.exception.InvalidConfigurationException;
+import io.entgra.device.mgt.core.application.mgt.core.exception.BadRequestException;
-import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationManager;
+import io.entgra.device.mgt.core.application.mgt.core.impl.VppApplicationManagerImpl;
-import io.entgra.device.mgt.core.application.mgt.common.services.ApplicationStorageManager;
-import io.entgra.device.mgt.core.application.mgt.common.services.ReviewManager;
-import io.entgra.device.mgt.core.application.mgt.common.services.SubscriptionManager;
 import io.entgra.device.mgt.core.application.mgt.core.lifecycle.LifecycleStateManager;
+import io.entgra.device.mgt.core.device.mgt.common.Base64File;
+import io.entgra.device.mgt.core.device.mgt.common.DeviceManagementConstants;
+import io.entgra.device.mgt.core.device.mgt.common.metadata.mgt.MetadataManagementService;
 import io.entgra.device.mgt.core.device.mgt.core.common.util.FileUtil;
+import io.entgra.device.mgt.core.device.mgt.core.metadata.mgt.MetadataManagementServiceImpl;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.lang.reflect.Constructor;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.channels.Channels;
+import java.nio.channels.ReadableByteChannel;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Base64;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -183,6 +206,10 @@ public class ApplicationManagementUtil {
         return getInstance(extension, LifecycleStateManager.class);
     }
 
+    public static VPPApplicationManager getVPPManagerInstance() {
+        // TODO: implement as an extension
+        return new VppApplicationManagerImpl();
+    }
     /**
      * This is useful to delete application artifacts if any error occurred while creating release/application
      * after uploading the artifacts
@@ -247,4 +274,265 @@ public class ApplicationManagementUtil {
             throw new InvalidConfigurationException(msg, e);
         }
     }
+
+    public static void persistApp(ItuneAppDTO product) throws ApplicationManagementException {
+        ApplicationManager applicationManager = APIUtil.getApplicationManager();
+        List<Category> categories = applicationManager.getRegisteredCategories();
+        if (product != null && product.getVersion() != null) {
+            // Generate artifacts
+            ApplicationArtifact applicationArtifact = generateArtifacts(product);
+
+            List<String> packageNamesOfApps = new ArrayList<>();
+            packageNamesOfApps.add(product.getPackageName());
+
+            List<Application> existingApps = applicationManager.getApplications(packageNamesOfApps);
+
+            if (existingApps != null && existingApps.size() > 0) {
+                Application app = existingApps.get(0);
+                if (product.getPackageName().equals(app.getPackageName())) {
+                    ApplicationUpdateWrapper applicationUpdateWrapper = generatePubAppUpdateWrapper(product, categories);
+                    applicationManager.updateApplication(app.getId(), applicationUpdateWrapper);
+
+                    PublicAppReleaseWrapper publicAppReleaseWrapper = new PublicAppReleaseWrapper();
+                    if (app.getSubMethod()
+                            .equalsIgnoreCase(Constants.ApplicationProperties.FREE_SUB_METHOD)) {
+                        publicAppReleaseWrapper.setPrice(0.0);
+                    } else {
+                        publicAppReleaseWrapper.setPrice(1.0);
+                    }
+
+                    publicAppReleaseWrapper.setDescription(product.getDescription());
+                    publicAppReleaseWrapper.setReleaseType("ga");
+                    publicAppReleaseWrapper.setVersion(product.getVersion());
+                    publicAppReleaseWrapper.setSupportedOsVersions("4.0-12.3");
+                    applicationManager.updatePubAppRelease(app.getApplicationReleases().get(0).getUuid(),
+                            publicAppReleaseWrapper, applicationArtifact);
+                    return;
+                }
+            } else {
+
+                // Generate App wrapper
+                PublicAppWrapper publicAppWrapper = generatePubAppWrapper(product, categories);
+                PublicAppReleaseWrapper appReleaseWrapper = new PublicAppReleaseWrapper();
+
+                if (publicAppWrapper.getSubMethod()
+                        .equalsIgnoreCase(Constants.ApplicationProperties.FREE_SUB_METHOD)) {
+                    appReleaseWrapper.setPrice(0.0);
+                } else {
+                    appReleaseWrapper.setPrice(1.0);
+                }
+
+                appReleaseWrapper.setDescription(product.getDescription());
+                appReleaseWrapper.setReleaseType("ga");
+                appReleaseWrapper.setVersion(product.getVersion());
+                appReleaseWrapper.setPackageName(product.getPackageName());
+                appReleaseWrapper.setSupportedOsVersions("4.0-12.3");
+
+                publicAppWrapper.setPublicAppReleaseWrappers(
+                        Arrays.asList(new PublicAppReleaseWrapper[]{appReleaseWrapper}));
+
+                try {
+                    updateImages(appReleaseWrapper, applicationArtifact.getIconName(),
+                            applicationArtifact.getIconStream(), applicationArtifact.getScreenshots());
+
+                    Application application = applicationManager.createApplication(publicAppWrapper, false);
+                    if (application != null && (application.getApplicationReleases().get(0).getCurrentStatus() == null
+                            || application.getApplicationReleases().get(0).getCurrentStatus().equals("CREATED"))) {
+                        String uuid = application.getApplicationReleases().get(0).getUuid();
+                        LifecycleChanger lifecycleChanger = new LifecycleChanger();
+                        lifecycleChanger.setAction("IN-REVIEW");
+                        applicationManager.changeLifecycleState(uuid, lifecycleChanger);
+                        lifecycleChanger.setAction("APPROVED");
+                        applicationManager.changeLifecycleState(uuid, lifecycleChanger);
+                        lifecycleChanger.setAction("PUBLISHED");
+                        applicationManager.changeLifecycleState(uuid, lifecycleChanger);
+                    }
+                } catch (IOException e) {
+                    String msg = "Error while downloading images of release.";
+                    log.error(msg);
+                    throw new ApplicationManagementException(msg, e);
+                }
+            }
+        }
+    }
+
+    private static PublicAppWrapper generatePubAppWrapper(ItuneAppDTO product, List<Category> categories) {
+        PublicAppWrapper publicAppWrapper = new PublicAppWrapper();
+        publicAppWrapper.setName(product.getTitle());
+        publicAppWrapper.setDescription(product.getDescription());
+        publicAppWrapper.setCategories(
+                Collections.singletonList(Constants.ApplicationProperties.APPLE_STORE_SYNCED_APP_CATEGORY));//Default category
+        for (Category category : categories) {
+            if (product.getCategory() == null) {
+                List<String> pubAppCategories = new ArrayList<>();
+                pubAppCategories.add(Constants.ApplicationProperties.APPLE_STORE_SYNCED_APP_CATEGORY);
+                publicAppWrapper.setCategories(pubAppCategories);
+                break;
+            } else if (product.getCategory().equalsIgnoreCase(category.getCategoryName())) {
+                List<String> pubAppCategories = new ArrayList<>();
+                pubAppCategories.add(category.getCategoryName());
+                pubAppCategories.add(Constants.ApplicationProperties.APPLE_STORE_SYNCED_APP_CATEGORY);
+                publicAppWrapper.setCategories(pubAppCategories);
+                break;
+            }
+        }
+        if (product.getPaymentMethod().equalsIgnoreCase(Constants.ApplicationProperties.FREE_SUB_METHOD)) {
+            publicAppWrapper.setSubMethod(Constants.ApplicationProperties.FREE_SUB_METHOD);
+        } else {
+            publicAppWrapper.setSubMethod(Constants.ApplicationProperties.PAID_SUB_METHOD);
+        }
+        // TODO: purchase an app from app store and see how to capture the real value for price
+        // field.
+        publicAppWrapper.setPaymentCurrency("$");
+        publicAppWrapper.setDeviceType(DeviceManagementConstants.MobileDeviceTypes.MOBILE_DEVICE_TYPE_IOS);
+        return publicAppWrapper;
+    }
+
+    private static ApplicationUpdateWrapper generatePubAppUpdateWrapper(ItuneAppDTO product, List<Category> categories) {
+        ApplicationUpdateWrapper applicationUpdateWrapper = new ApplicationUpdateWrapper();
+        applicationUpdateWrapper.setName(product.getTitle());
+        applicationUpdateWrapper.setDescription(product.getDescription());
+        applicationUpdateWrapper.setCategories(
+                Collections.singletonList(Constants
+                        .ApplicationProperties.APPLE_STORE_SYNCED_APP_CATEGORY));//Default
+        // add the default APPLE_STORE_SYNCED_APP_CATEGORY
+        for (Category category : categories) {
+            if (product.getCategory() == null) {
+                List<String> pubAppCategories = new ArrayList<>();
+                pubAppCategories.add(Constants.ApplicationProperties.APPLE_STORE_SYNCED_APP_CATEGORY);
+                applicationUpdateWrapper.setCategories(pubAppCategories);
+                break;
+            } else if (product.getCategory().equalsIgnoreCase(category.getCategoryName())) {
+                List<String> pubAppCategories = new ArrayList<>();
+                pubAppCategories.add(category.getCategoryName());
+                pubAppCategories.add(Constants.ApplicationProperties.APPLE_STORE_SYNCED_APP_CATEGORY);
+                applicationUpdateWrapper.setCategories(pubAppCategories);
+                break;
+            }
+        }
+        if (product.getPaymentMethod().equalsIgnoreCase(Constants.ApplicationProperties.FREE_SUB_METHOD)) {
+            applicationUpdateWrapper.setSubMethod(Constants.ApplicationProperties.FREE_SUB_METHOD);
+        } else {
+            applicationUpdateWrapper.setSubMethod(Constants.ApplicationProperties.PAID_SUB_METHOD);
+        }
+        // TODO: purchase an app from Playstore and see how to capture the real value for price field.
+        applicationUpdateWrapper.setPaymentCurrency("$");
+        return applicationUpdateWrapper;
+    }
+
+    private static ApplicationArtifact generateArtifacts(ItuneAppDTO product) throws ApplicationManagementException {
+        ApplicationArtifact applicationArtifact = new ApplicationArtifact();
+        String prefix = product.getPackageName();
+        try {
+            String iconName = prefix + "_icon";
+            applicationArtifact.setIconName(iconName);
+            InputStream iconInputStream = getInputStream(iconName, product.getIconURL());
+            applicationArtifact.setIconStream(iconInputStream);
+            Map<String, InputStream> screenshotMap = new HashMap<>();
+            // TODO: look for a way to get screenshots
+
+            for (int a = 0; a < 3; a++) {
+                String screenshotName = product.getPackageName() + a;
+                InputStream screenshotInputStream = getInputStream(screenshotName, product.getIconURL());
+                screenshotMap.put(screenshotName, screenshotInputStream);
+            }
+
+            applicationArtifact.setScreenshots(screenshotMap);
+            return applicationArtifact;
+        } catch (ApplicationManagementException e) {
+            String msg = "Error occurred while generating Application artifact";
+            log.error(msg);
+            throw new ApplicationManagementException(msg, e);
+        }
+    }
+
+    private static InputStream getInputStream(String filename, String url) throws ApplicationManagementException {
+        URL website;
+        try {
+            website = new URL(url);
+        } catch (MalformedURLException e) {
+            String msg = "Error occurred while converting the url " + url;
+            log.error(msg);
+            throw new ApplicationManagementException(msg, e);
+        }
+        ReadableByteChannel rbc = null;
+        FileOutputStream fos = null;
+        try {
+            rbc = Channels.newChannel(website.openStream());
+            fos = new FileOutputStream(System.getProperty("java.io.tmpdir")
+                    + File.separator + filename);
+            fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+        } catch (IOException e) {
+            String msg = "Error occurred while opening stream for url " + url;
+            log.error(msg);
+            throw new ApplicationManagementException(msg, e);
+        } finally {
+            try {
+                fos.close();
+                rbc.close();
+            } catch (IOException e) {
+            }
+        }
+
+        File file = new File(System.getProperty("java.io.tmpdir") + File.separator + filename);
+        InputStream targetStream;
+        try {
+            targetStream = new FileInputStream(file);
+        } catch (FileNotFoundException e) {
+            String msg = "Error occurred while reading the tmp file  " + System.getProperty("java.io.tmpdir")
+                    + File.separator + filename;
+            log.error(msg);
+            throw new ApplicationManagementException(msg, e);
+        }
+        file.deleteOnExit();
+        return targetStream;
+    }
+
+    private static void updateImages(PublicAppReleaseWrapper appReleaseWrapper, String iconName,
+                                     InputStream iconStream, Map<String, InputStream>
+                                             screenshotsMaps) throws IOException {
+        List<Base64File> screenshots = new ArrayList<>();
+        Base64File iconFile = new Base64File(iconName,
+                convertStreamToBase64(iconStream));
+        appReleaseWrapper.setIcon(iconFile);
+        if (screenshotsMaps.size() > 0) {
+            for (Map.Entry<String, InputStream> screenshotEntry : screenshotsMaps.entrySet()) {
+                Base64File screenshot = new Base64File(screenshotEntry.getKey(),
+                        convertStreamToBase64(screenshotEntry.getValue()));
+                screenshots.add(screenshot);
+            }
+            appReleaseWrapper.setScreenshots(screenshots);
+        }
+    }
+
+    private static String convertStreamToBase64(InputStream inputStream) throws IOException {
+        final int bufLen = 4 * 0x400; // 4KB
+        byte[] buf = new byte[bufLen];
+        int readLen;
+
+        try {
+            try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
+                while ((readLen = inputStream.read(buf, 0, bufLen)) != -1)
+                    outputStream.write(buf, 0, readLen);
+
+                return Base64.getEncoder().encodeToString(outputStream.toByteArray());
+            }
+        } catch (IOException e) {
+            String msg = "Error while converting image to base64";
+            log.error(msg);
+            throw e;
+        } finally {
+            try {
+                inputStream.close();
+            } catch (IOException e) {
+            }
+        }
+    }
+
+    public static List<Application> getAppDetails(String adamId) throws ApplicationManagementException {
+        ApplicationManager applicationManager = APIUtil.getApplicationManager();
+        List<String> packageNamesOfApps = new ArrayList<>();
+        packageNamesOfApps.add(adamId);
+        return applicationManager.getApplications(packageNamesOfApps);
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/Constants.java

@@ -74,6 +74,7 @@ public class Constants {
     public static final String IS_USER_ABLE_TO_VIEW_ALL_ROLES = "isUserAbleToViewAllRoles";
     public static final String GOOGLE_PLAY_STORE_URL = "https://play.google.com/store/apps/details?id=";
     public static final String APPLE_STORE_URL = "https://itunes.apple.com/country/app/app-name/id";
+    public static final String GOOGLE_PLAY_SYNCED_APP = "GooglePlaySyncedApp";
 
     // Subscription task related constants
     public static final String SUBSCRIBERS = "SUBSCRIBERS";
@@ -101,6 +102,25 @@ public class Constants {
     }
     public static final Map<String, String> AGENT_FILE_NAMES = Collections.unmodifiableMap(AGENT_DATA);
 
+    public static final class VPP {
+        public static final String GET = "GET";
+        public static final String BEARER = "Bearer ";
+        public static final String EXECUTOR_EXCEPTION_PREFIX = "ExecutorException-";
+        public static final String TOKEN_IS_EXPIRED = "ACCESS_TOKEN_IS_EXPIRED";
+        public static final int INTERNAL_ERROR_CODE = 500;
+        public static final String POST = "POST";
+        public static final String PUT = "PUT";
+        public static final String DELETE = "DELETE";
+        public static final String EVENT_ID = "eventId";
+        public static final String CLIENT_USER_ID_PARAM = "?clientUserId=";
+        public static final String TOTAL_PAGES = "totalPages";
+        public static final String GET_APP_DATA_RESPONSE_START = "results";
+        public static final String REMOTE_FILE_NAME = "512x512w.png";
+
+        private VPP() {
+        }
+    }
+
 
     /**
      * Database types supported by Application Management.
@@ -165,4 +185,31 @@ public class Constants {
         public static final String AUTHORIZATION = "Authorization";
         public static final String AUTHORIZATION_HEADER_VALUE = "Bearer ";
     }
+
+    public final class ApplicationProperties {
+        private ApplicationProperties() {
+            throw new AssertionError();
+        }
+
+        public static final String NAME = "name";
+        public static final String VERSION = "version";
+        public static final String FREE_SUB_METHOD = "FREE";
+        public static final String PAID_SUB_METHOD = "PAID";
+        public static final String TYPE = "type";;
+        public static final String PACKAGE_NAME = "packageName";
+        public static final String APPLE_STORE_SYNCED_APP_CATEGORY = "AppleStoreSyncedApp";
+
+        public static final String RESULTS = "results";
+        public static final String ARTWORK = "artwork";
+        public static final String URL = "url";
+        public static final String DESCRIPTION = "description";
+        public static final String STANDARD = "standard";
+        public static final String OFFERS = "offers";
+        public static final String PRICE = "price";
+        public static final String DISPLAY = "display";
+        public static final String GENRE_NAMES = "genreNames";
+        public static final String PRICE_ZERO = "0.0";
+        public static final String ASSOCIATION_DEVICE = "ASSOCIATION_DEVICE";
+        public static final String ASSOCIATION_USER = "ASSOCIATION_USER";
+    }
 }

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/DAOUtil.java

@@ -19,30 +19,27 @@ package io.entgra.device.mgt.core.application.mgt.core.util;
 
 import com.google.gson.Gson;
 import com.google.gson.reflect.TypeToken;
-import io.entgra.device.mgt.core.application.mgt.common.dto.IdentityServerDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.*;
 import io.entgra.device.mgt.core.application.mgt.core.exception.UnexpectedServerErrorException;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.json.JSONException;
 import io.entgra.device.mgt.core.application.mgt.common.ExecutionStatus;
 import io.entgra.device.mgt.core.application.mgt.common.SubscriptionType;
-import io.entgra.device.mgt.core.application.mgt.common.dto.ApplicationDTO;
 
-import io.entgra.device.mgt.core.application.mgt.common.dto.ApplicationReleaseDTO;
-import io.entgra.device.mgt.core.application.mgt.common.dto.DeviceSubscriptionDTO;
-import io.entgra.device.mgt.core.application.mgt.common.dto.ReviewDTO;
-import io.entgra.device.mgt.core.application.mgt.common.dto.ScheduledSubscriptionDTO;
 import io.entgra.device.mgt.core.device.mgt.common.DeviceIdentifier;
 
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Timestamp;
+import java.text.SimpleDateFormat;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Date;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
@@ -241,6 +238,26 @@ public class DAOUtil {
         return applicationDTOs.get(0);
     }
 
+    public static ApplicationDTO loadDeviceApp(ResultSet rs) throws SQLException {
+        ApplicationDTO application = new ApplicationDTO();
+        application.setId( rs.getInt("APP_ID"));
+        application.setName(rs.getString("APP_NAME"));
+        application.setDescription(rs.getString("APP_DESCRIPTION"));
+        application.setType(rs.getString("APP_TYPE"));
+        application.setSubType(rs.getString("APP_SUB_TYPE"));
+        application.setPaymentCurrency(rs.getString("APP_CURRENCY"));
+        application.setStatus(rs.getString("APP_STATUS"));
+        application.setAppRating(rs.getDouble("APP_RATING"));
+        application.setDeviceTypeId(rs.getInt("APP_DEVICE_TYPE_ID"));
+        ApplicationReleaseDTO releaseDTO = constructAppReleaseDTO(rs);
+        List<ApplicationReleaseDTO> releaseDtoList = new ArrayList<>();
+        if (releaseDTO != null) {
+            releaseDtoList.add(constructAppReleaseDTO(rs));
+            application.setApplicationReleaseDTOs(releaseDtoList);
+        }
+        return application;
+    }
+
     /**
      * Populates {@link ApplicationReleaseDTO} object with the result obtained from the database.
      *
@@ -344,6 +361,156 @@ public class DAOUtil {
         return subscriptionDTOS;
     }
 
+    public static VppUserDTO loadVppUser(ResultSet rs) throws SQLException, UnexpectedServerErrorException {
+        List<VppUserDTO> vppUserDTOS = loadVppUsers(rs);
+        if (vppUserDTOS.isEmpty()) {
+            return null;
+        }
+        if (vppUserDTOS.size() > 1) {
+            String msg = "Internal server error. Found more than one vpp user for requested emmUsername";
+            log.error(msg);
+            throw new UnexpectedServerErrorException(msg);
+        }
+        return vppUserDTOS.get(0);
+    }
+
+    public static List<VppUserDTO> loadVppUsers (ResultSet rs) throws SQLException {
+        List<VppUserDTO> vppUserDTOS = new ArrayList<>();
+        while (rs.next()) {
+            VppUserDTO vppUserDTO = new VppUserDTO();
+            vppUserDTO.setId(rs.getInt("ID"));
+            vppUserDTO.setClientUserId(rs.getString("CLIENT_USER_ID"));
+            vppUserDTO.setTenantId(rs.getInt("TENANT_ID"));
+            vppUserDTO.setEmail(rs.getString("EMAIL"));
+            vppUserDTO.setInviteCode(rs.getString("INVITE_CODE"));
+            if (columnExist(rs,"STATUS")) {
+                vppUserDTO.setStatus(rs.getString("STATUS"));
+            }
+            if (columnExist(rs,"MANAGED_ID")) {
+                vppUserDTO.setManagedId(rs.getString("MANAGED_ID"));
+            }
+            if (columnExist(rs,"TEMP_PASSWORD")) {
+                vppUserDTO.setTmpPassword(rs.getString("TEMP_PASSWORD"));
+            }
+            if (columnExist(rs,"DM_USERNAME")) {
+                vppUserDTO.setDmUsername(rs.getString("DM_USERNAME"));
+            }
+            if (rs.getLong("CREATED_TIME") != 0) {
+                Date date = new Date(rs.getLong("CREATED_TIME"));
+                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                String dateString = dateFormat.format(date);
+                vppUserDTO.setCreatedTime(dateString);
+            }
+            if (rs.getLong("LAST_UPDATED_TIME") != 0) {
+                Date date = new Date(rs.getLong("LAST_UPDATED_TIME"));
+                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                String dateString = dateFormat.format(date);
+                vppUserDTO.setLastUpdatedTime(dateString);
+            }
+            vppUserDTOS.add(vppUserDTO);
+        }
+        return vppUserDTOS;
+    }
+
+    private static boolean columnExist(ResultSet rs, String column){
+        try{
+            rs.findColumn(column);
+            return true;
+        } catch (SQLException sqlex){
+        }
+
+        return false;
+    }
+
+    public static VppAssetDTO loadAsset(ResultSet rs) throws SQLException, UnexpectedServerErrorException {
+        List<VppAssetDTO> vppAssetDTOS = loadAssets(rs);
+        if (vppAssetDTOS.isEmpty()) {
+            return null;
+        }
+        if (vppAssetDTOS.size() > 1) {
+            String msg = "Internal server error. Found more than one asset for given app id.";
+            log.error(msg);
+            throw new UnexpectedServerErrorException(msg);
+        }
+        return vppAssetDTOS.get(0);
+    }
+
+    public static List<VppAssetDTO> loadAssets (ResultSet rs) throws SQLException {
+        List<VppAssetDTO> vppAssetDTOS = new ArrayList<>();
+        while (rs.next()) {
+            VppAssetDTO vppAssetDTO = new VppAssetDTO();
+            vppAssetDTO.setId(rs.getInt("ID"));
+            vppAssetDTO.setAppId(rs.getInt("APP_ID"));
+            vppAssetDTO.setTenantId(rs.getInt("TENANT_ID"));
+            if (rs.getLong("CREATED_TIME") != 0) {
+                Date date = new Date(rs.getLong("CREATED_TIME"));
+                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                String dateString = dateFormat.format(date);
+                vppAssetDTO.setCreatedTime(dateString);
+            }
+            if (rs.getLong("LAST_UPDATED_TIME") != 0) {
+                Date date = new Date(rs.getLong("LAST_UPDATED_TIME"));
+                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                String dateString = dateFormat.format(date);
+                vppAssetDTO.setLastUpdatedTime(dateString);
+            }
+            vppAssetDTO.setAdamId(rs.getString("ADAM_ID"));
+            vppAssetDTO.setAssignedCount(rs.getString("ASSIGNED_COUNT"));
+            vppAssetDTO.setDeviceAssignable(rs.getString("DEVICE_ASSIGNABLE"));
+            vppAssetDTO.setPricingParam(rs.getString("PRICING_PARAMS"));
+            vppAssetDTO.setProductType(rs.getString("PRODUCT_TYPE"));
+            vppAssetDTO.setRetiredCount(rs.getString("RETIRED_COUNT"));
+            vppAssetDTO.setRevocable(rs.getString("REVOCABLE"));
+//            String jsonString = rs.getString("SUPPORTED_PLATFORMS");
+//            ObjectMapper objectMapper = new ObjectMapper();
+//            try {
+//                List<String> platformList = objectMapper.readValue(jsonString, new TypeReference<List<String>>() {});
+//                vppAssetDTO.setSupportedPlatforms(platformList);
+//            } catch (IOException e) {
+//                e.printStackTrace();
+//            }
+            vppAssetDTOS.add(vppAssetDTO);
+        }
+        return vppAssetDTOS;
+    }
+
+    public static VppAssociationDTO loadAssignment(ResultSet rs) throws SQLException, UnexpectedServerErrorException {
+        List<VppAssociationDTO> vppAssociationDTOS = loadAssignments(rs);
+        if (vppAssociationDTOS.isEmpty()) {
+            return null;
+        }
+        if (vppAssociationDTOS.size() > 1) {
+            String msg = "Internal server error. Found more than one asset for given app id.";
+            log.error(msg);
+            throw new UnexpectedServerErrorException(msg);
+        }
+        return vppAssociationDTOS.get(0);
+    }
+
+    public static List<VppAssociationDTO> loadAssignments (ResultSet rs) throws SQLException {
+        List<VppAssociationDTO> vppAssociationDTOS = new ArrayList<>();
+        while (rs.next()) {
+            VppAssociationDTO vppAssociationDTO = new VppAssociationDTO();
+            vppAssociationDTO.setId(rs.getInt("ID"));
+            vppAssociationDTO.setAssociationType(rs.getString("ASSOCIATION_TYPE"));
+            if (rs.getLong("CREATED_TIME") != 0) {
+                Date date = new Date(rs.getLong("CREATED_TIME"));
+                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                String dateString = dateFormat.format(date);
+                vppAssociationDTO.setCreatedTime(dateString);
+            }
+            if (rs.getLong("LAST_UPDATED_TIME") != 0) {
+                Date date = new Date(rs.getLong("LAST_UPDATED_TIME"));
+                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+                String dateString = dateFormat.format(date);
+                vppAssociationDTO.setLastUpdatedTime(dateString);
+            }
+            vppAssociationDTO.setPricingParam(rs.getString("PRICING_PARAMS"));
+            vppAssociationDTOS.add(vppAssociationDTO);
+        }
+        return vppAssociationDTOS;
+    }
+
     /**
      * Cleans up the statement and resultset after executing the query
      *

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/VppHttpUtil.java

@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.application.mgt.core.util;
+
+import com.google.gson.Gson;
+import io.entgra.device.mgt.core.application.mgt.common.dto.ProxyResponse;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssetDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppAssociationDTO;
+import io.entgra.device.mgt.core.application.mgt.common.dto.VppUserDTO;
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.http.Consts;
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpHeaders;
+import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.client.methods.HttpPut;
+import org.apache.http.client.methods.HttpRequestBase;
+import org.apache.http.entity.ContentType;
+import org.apache.http.entity.StringEntity;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClients;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.wso2.carbon.context.PrivilegedCarbonContext;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+
+public class VppHttpUtil {
+    private static final Log log = LogFactory.getLog(VppHttpUtil.class);
+
+    public static ProxyResponse execute(String url,
+                                  String payload,
+                                  String accessToken,
+                                  String method) throws IOException {
+
+        HttpRequestBase endpoint = null;
+        if (Constants.VPP.GET.equalsIgnoreCase(method) || Constants.VPP.DELETE.equalsIgnoreCase(method)) {
+            endpoint = new HttpGet(url);
+            addHeaders(endpoint, accessToken);
+            return VppHttpUtil.execute(endpoint);
+        } else if (Constants.VPP.POST.equalsIgnoreCase(method)) {
+            endpoint = new HttpPost(url);
+        } else if (Constants.VPP.PUT.equalsIgnoreCase(method)) {
+            endpoint = new HttpPut(url);
+        }
+        addHeaders(endpoint, accessToken);
+
+
+        if (payload != null) {
+            HttpEntity forwardRequestBody = new StringEntity(payload, ContentType.APPLICATION_JSON.toString(), "utf-8");
+            if (Constants.VPP.POST.equalsIgnoreCase(method)) {
+                ((HttpPost) endpoint).setEntity(forwardRequestBody);
+            } else if (Constants.VPP.PUT.equalsIgnoreCase(method)) {
+                ((HttpPut) endpoint).setEntity(forwardRequestBody);
+            }
+
+        }
+        if (log.isDebugEnabled()) {
+            log.info("Forwarding request to " + url);
+        }
+        return VppHttpUtil.execute(endpoint);
+    }
+
+    private static void addHeaders(HttpRequestBase endpoint, String accessToken) {
+        endpoint.setHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());
+        endpoint.setHeader(HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.toString());
+        endpoint.setHeader(HttpHeaders.AUTHORIZATION, Constants.VPP.BEARER + accessToken);
+    }
+
+
+    /***
+     *
+     * @param httpRequest - httpMethod e.g:- HttpPost, HttpGet
+     * @return response as string
+     * @throws IOException IO exception returns if error occurs when executing the httpMethod
+     */
+    private static ProxyResponse execute(HttpRequestBase httpRequest) throws IOException {
+        try (CloseableHttpClient client = getHttpClient()) {
+            HttpResponse response = client.execute(httpRequest);
+            ProxyResponse proxyResponse = new ProxyResponse();
+
+            if (response == null) {
+                log.error("Received null response for http request : " + httpRequest.getMethod() + " " + httpRequest
+                        .getURI().toString());
+                proxyResponse.setCode(Constants.VPP.INTERNAL_ERROR_CODE);
+                proxyResponse.setExecutorResponse(Constants.VPP.EXECUTOR_EXCEPTION_PREFIX + getStatusKey(
+                        Constants.VPP.INTERNAL_ERROR_CODE));
+                return proxyResponse;
+            } else {
+                int statusCode = response.getStatusLine().getStatusCode();
+                try (BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()))) {
+                    StringBuilder result = new StringBuilder();
+                    String line;
+                    while ((line = rd.readLine()) != null) {
+                        result.append(line);
+                    }
+
+                    String jsonString = result.toString();
+                    if (statusCode == HttpStatus.SC_OK || statusCode == HttpStatus.SC_CREATED) {
+                        proxyResponse.setCode(statusCode);
+                        proxyResponse.setData(jsonString);
+                        proxyResponse.setExecutorResponse("SUCCESS");
+                        return proxyResponse;
+                    } else if (statusCode == HttpStatus.SC_UNAUTHORIZED) {
+                        if (jsonString.contains("Access token expired") || jsonString
+                                .contains("Invalid input. Access token validation failed")) {
+                            proxyResponse.setCode(statusCode);
+                            proxyResponse.setExecutorResponse(Constants.VPP.TOKEN_IS_EXPIRED);
+                            return proxyResponse;
+                        } else {
+                            log.error(
+                                    "Received " + statusCode + " response for http request : " + httpRequest.getMethod()
+                                            + " " + httpRequest.getURI().toString() + ". Error message: " + jsonString);
+                            proxyResponse.setCode(statusCode);
+                            proxyResponse.setData(jsonString);
+                            proxyResponse.setExecutorResponse(
+                                    Constants.VPP.EXECUTOR_EXCEPTION_PREFIX + getStatusKey(statusCode));
+                            return proxyResponse;
+                        }
+                    }
+                    log.error("Received " + statusCode +
+                            " response for http request : " + httpRequest.getMethod() + " " + httpRequest.getURI()
+                            .toString() + ". Error message: " + jsonString);
+                    proxyResponse.setCode(statusCode);
+                    proxyResponse.setData(jsonString);
+                    proxyResponse
+                            .setExecutorResponse(Constants.VPP.EXECUTOR_EXCEPTION_PREFIX + getStatusKey(statusCode));
+                    return proxyResponse;
+                }
+            }
+        }
+    }
+
+    /***
+     *
+     * @param statusCode Provide status code, e.g:- 400, 401, 500 etc
+     * @return relative status code key for given status code.
+     */
+    public static String getStatusKey(int statusCode) {
+        String statusCodeKey;
+
+        switch (statusCode) {
+            case HttpStatus.SC_INTERNAL_SERVER_ERROR:
+                statusCodeKey = "internalServerError";
+                break;
+            case HttpStatus.SC_BAD_REQUEST:
+                statusCodeKey = "badRequest";
+                break;
+            case HttpStatus.SC_UNAUTHORIZED:
+                statusCodeKey = "unauthorized";
+                break;
+            case HttpStatus.SC_FORBIDDEN:
+                statusCodeKey = "forbidden";
+                break;
+            case HttpStatus.SC_NOT_FOUND:
+                statusCodeKey = "notFound";
+                break;
+            case HttpStatus.SC_METHOD_NOT_ALLOWED:
+                statusCodeKey = "methodNotAllowed";
+                break;
+            case HttpStatus.SC_NOT_ACCEPTABLE:
+                statusCodeKey = "notAcceptable";
+                break;
+            case HttpStatus.SC_UNSUPPORTED_MEDIA_TYPE:
+                statusCodeKey = "unsupportedMediaType";
+                break;
+            default:
+                statusCodeKey = "defaultPage";
+                break;
+        }
+        return statusCodeKey;
+    }
+
+
+    /***
+     * Handle error requests.
+     *
+     * @param resp {@link HttpServletResponse}
+     * @param proxyResponse {@link ProxyResponse}
+     * @throws IOException If error occurred when trying to send the error response.
+     */
+    public static void handleError(HttpServletResponse resp, ProxyResponse proxyResponse) throws IOException {
+        Gson gson = new Gson();
+        if (proxyResponse == null) {
+            proxyResponse = new ProxyResponse();
+            proxyResponse.setCode(HttpStatus.SC_INTERNAL_SERVER_ERROR);
+            proxyResponse.setExecutorResponse(Constants.VPP.EXECUTOR_EXCEPTION_PREFIX + VppHttpUtil
+                    .getStatusKey(Constants.VPP.INTERNAL_ERROR_CODE));
+        }
+        resp.setStatus(proxyResponse.getCode());
+        resp.setContentType(ContentType.APPLICATION_JSON.getMimeType());
+        resp.setCharacterEncoding(Consts.UTF_8.name());
+
+        proxyResponse.setExecutorResponse(null);
+        try (PrintWriter writer = resp.getWriter()) {
+            writer.write(gson.toJson(proxyResponse));
+        }
+    }
+
+    /**
+     * Handle error requests with custom error codes.
+     *
+     * @param resp      {@link HttpServletResponse}
+     * @param errorCode HTTP error status code
+     * @throws IOException If error occurred when trying to send the error response.
+     */
+    public static void handleError(HttpServletResponse resp, int errorCode)
+            throws IOException {
+        ProxyResponse proxyResponse = new ProxyResponse();
+        proxyResponse.setCode(errorCode);
+        proxyResponse.setExecutorResponse(
+                Constants.VPP.EXECUTOR_EXCEPTION_PREFIX + VppHttpUtil.getStatusKey(errorCode));
+        VppHttpUtil.handleError(resp, proxyResponse);
+    }
+
+    /***
+     *
+     * @param resp {@link HttpServletResponse}
+     * Return Success Response.
+     */
+    public static void handleSuccess(HttpServletResponse resp, ProxyResponse proxyResponse) throws IOException {
+        if (proxyResponse == null) {
+            handleError(resp, null);
+            return;
+        }
+        resp.setStatus(proxyResponse.getCode());
+        resp.setContentType(ContentType.APPLICATION_JSON.getMimeType());
+        resp.setCharacterEncoding(Consts.UTF_8.name());
+        JSONObject response = new JSONObject();
+        String responseData = proxyResponse.getData();
+
+        if (!StringUtils.isEmpty(responseData)) {
+            try {
+                if (responseData.startsWith("{")) {
+                    JSONObject responseDataJsonObj = new JSONObject(responseData);
+                    response.put("data", responseDataJsonObj);
+                } else if (responseData.startsWith("[")) {
+                    JSONArray responseDataJsonArr = new JSONArray(responseData);
+                    response.put("data", responseDataJsonArr);
+                } else {
+                    log.warn("Response data is not valid json string >> " + responseData);
+                    response.put("data", responseData);
+                }
+            } catch (JSONException e) {
+                log.error("Response data is not passable");
+                response.put("data", responseData);
+            }
+        }
+
+        try (PrintWriter writer = resp.getWriter()) {
+            writer.write(response.toString());
+        }
+    }
+
+    /**
+     * Retrieve Http client based on hostname verification.
+     *
+     * @return {@link CloseableHttpClient} http client
+     */
+    public static CloseableHttpClient getHttpClient() {
+        return HttpClients.custom().setMaxConnTotal(1).setMaxConnPerRoute(1).build();
+    }
+
+    public static VppAssociationDTO getAssociation(VppUserDTO user, VppAssetDTO asset) {
+        VppAssociationDTO associationDTO = new VppAssociationDTO();
+        associationDTO.setAdamId(asset.getAdamId());
+        associationDTO.setClientUserId(user.getClientUserId());
+        associationDTO.setPricingParam(asset.getPricingParam());
+        associationDTO.setAssociationType(Constants.ApplicationProperties.ASSOCIATION_USER);
+
+        associationDTO.setAssetId(asset.getId());
+        associationDTO.setClientId(user.getId());
+        associationDTO.setTenantId(PrivilegedCarbonContext.getThreadLocalCarbonContext()
+                .getTenantId(true));
+        associationDTO.setCreatedTime(String.valueOf(System.currentTimeMillis()));
+        associationDTO.setLastUpdatedTime(String.valueOf(System.currentTimeMillis()));
+        return associationDTO;
+    }
+
+}

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/DeviceManagementConstants.java

@@ -29,6 +29,7 @@ public final class DeviceManagementConstants {
     public static final String GEOFENCE_CACHE = "GEOFENCE_CACHE";
     public static final String BILLING_CACHE = "BILLING_CACHE";
     public static final String META_KEY = "PER_DEVICE_COST";
+    public static final String DEP_META_KEY = "DEP_CONFIG";
     public static final String ACTIVE_STATUS = "ACTIVE";
     public static final String ENROLLMENT_NOTIFICATION_API_ENDPOINT = "/api/device-mgt/enrollment-notification";
     public static final String URL_SEPERATOR = "/";

features/application-mgt/io.entgra.device.mgt.core.application.mgt.server.feature/src/main/resources/conf/application-mgt.xml

@@ -171,6 +171,7 @@
         <Category>Video Players &amp; Editors</Category>
         <Category>Weather</Category>
         <Category>GooglePlaySyncedApp</Category>
+        <Category>AppleStoreSyncedApp</Category>
     </AppCategories>
 
     <RatingConfig>

features/application-mgt/io.entgra.device.mgt.core.application.mgt.server.feature/src/main/resources/conf_templates/templates/repository/conf/application-mgt.xml.j2

@@ -202,6 +202,7 @@
         <Category>Video Players &amp; Editors</Category>
         <Category>Weather</Category>
         <Category>GooglePlaySyncedApp</Category>
+        <Category>AppleStoreSyncedApp</Category>
     {% if application_mgt_conf.app_categories is defined %}
         {%- for app_category in application_mgt_conf.app_categories -%}
         <Category>{{app_category}}</Category>

features/application-mgt/io.entgra.device.mgt.core.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/h2.sql

@@ -325,3 +325,59 @@ CREATE TABLE IF NOT EXISTS AP_APP_FAVOURITES(
     FOREIGN KEY (AP_APP_ID)
     REFERENCES AP_APP (ID) ON DELETE NO ACTION ON UPDATE NO ACTION
 );
+
+-- -----------------------------------------------------
+-- Table AP_VPP_USER
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS AP_VPP_USER (
+    ID INT NOT NULL AUTO_INCREMENT,
+    CLIENT_USER_ID VARCHAR(255) NULL,
+    DM_USERNAME VARCHAR(255) NOT NULL,
+    TENANT_ID INT NOT NULL,
+    EMAIL VARCHAR(255) NULL,
+    INVITE_CODE VARCHAR(255) NULL,
+    STATUS VARCHAR(255) NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    MANAGED_ID VARCHAR(255) NULL,
+    TEMP_PASSWORD VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+);
+
+-- -----------------------------------------------------
+-- Table AP_ASSETS
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS AP_ASSETS (
+    ID INT NOT NULL AUTO_INCREMENT,
+    APP_ID INT NULL,
+    TENANT_ID INT NOT NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    ADAM_ID VARCHAR(255) NULL,
+    ASSIGNED_COUNT VARCHAR(255) NULL,
+    DEVICE_ASSIGNABLE VARCHAR(255) NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    PRODUCT_TYPE VARCHAR(255) NULL,
+    RETIRED_COUNT VARCHAR(255) NULL,
+    REVOCABLE VARCHAR(255) NULL,
+    SUPPORTED_PLATFORMS VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+);
+
+-- -----------------------------------------------------
+-- Table AP_VPP_ASSOCIATION
+-- -----------------------------------------------------
+
+CREATE TABLE IF NOT EXISTS AP_VPP_ASSOCIATION (
+    ID INT NOT NULL AUTO_INCREMENT,
+    ASSET_ID INT,
+    USER_ID INT,
+    TENANT_ID INT NOT NULL,
+    ASSOCIATION_TYPE VARCHAR(255) NOT NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    PRIMARY KEY (ID),
+    CONSTRAINT AP_VPP_ASSETS_fk FOREIGN KEY (ASSET_ID) REFERENCES AP_ASSETS (ID) ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT AP_VPP_VPP_USER_fk FOREIGN KEY (USER_ID) REFERENCES AP_VPP_USER (ID) ON DELETE CASCADE ON UPDATE CASCADE
+);

features/application-mgt/io.entgra.device.mgt.core.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/mssql.sql

@@ -342,3 +342,61 @@ CREATE TABLE AP_APP_FAVOURITES(
     FOREIGN KEY (AP_APP_ID)
     REFERENCES AP_APP (ID)
 );
+
+-- -----------------------------------------------------
+-- Table AP_VPP_USER
+-- -----------------------------------------------------
+IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'AP_VPP_USER') AND type in (N'U'))
+CREATE TABLE AP_VPP_USER (
+    ID INT NOT NULL IDENTITY(1,1),
+    CLIENT_USER_ID VARCHAR(255) NULL,
+    DM_USERNAME VARCHAR(255) NOT NULL,
+    TENANT_ID INT NOT NULL,
+    EMAIL VARCHAR(255) NULL,
+    INVITE_CODE VARCHAR(255) NULL,
+    STATUS VARCHAR(255) NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    MANAGED_ID VARCHAR(255) NULL,
+    TEMP_PASSWORD VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+);
+
+-- -----------------------------------------------------
+-- Table AP_ASSETS
+-- -----------------------------------------------------
+IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'AP_ASSETS') AND type in (N'U'))
+CREATE TABLE AP_ASSETS (
+    ID INT NOT NULL IDENTITY(1,1),
+    APP_ID INT NULL,
+    TENANT_ID INT NOT NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    ADAM_ID VARCHAR(255) NULL,
+    ASSIGNED_COUNT VARCHAR(255) NULL,
+    DEVICE_ASSIGNABLE VARCHAR(255) NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    PRODUCT_TYPE VARCHAR(255) NULL,
+    RETIRED_COUNT VARCHAR(255) NULL,
+    REVOCABLE VARCHAR(255) NULL,
+    SUPPORTED_PLATFORMS VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+);
+
+-- -----------------------------------------------------
+-- Table AP_VPP_ASSOCIATION
+-- -----------------------------------------------------
+IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'AP_VPP_ASSOCIATION') AND type in (N'U'))
+CREATE TABLE AP_VPP_ASSOCIATION (
+    ID INT NOT NULL IDENTITY(1,1),
+    ASSET_ID INT,
+    USER_ID INT,
+    TENANT_ID INT NOT NULL,
+    ASSOCIATION_TYPE VARCHAR(255) NOT NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    PRIMARY KEY (ID),
+    CONSTRAINT AP_VPP_ASSETS_fk FOREIGN KEY (ASSET_ID) REFERENCES AP_ASSETS (ID) ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT AP_VPP_VPP_USER_fk FOREIGN KEY (USER_ID) REFERENCES AP_VPP_USER (ID) ON DELETE CASCADE ON UPDATE CASCADE
+);

features/application-mgt/io.entgra.device.mgt.core.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/mysql.sql

@@ -273,3 +273,59 @@ CREATE TABLE IF NOT EXISTS AP_APP_FAVOURITES(
   PRIMARY KEY(ID),
   CONSTRAINT AP_APP_FAVOURITES_AP_APP_ID_fk FOREIGN KEY (AP_APP_ID) REFERENCES AP_APP (ID)
 );
+
+-- -----------------------------------------------------
+-- Table AP_VPP_USER
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS AP_VPP_USER (
+    ID INT NOT NULL AUTO_INCREMENT,
+    CLIENT_USER_ID VARCHAR(255) NULL,
+    DM_USERNAME VARCHAR(255) NOT NULL,
+    TENANT_ID INT NOT NULL,
+    EMAIL VARCHAR(255) NULL,
+    INVITE_CODE VARCHAR(255) NULL,
+    STATUS VARCHAR(255) NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    MANAGED_ID VARCHAR(255) NULL,
+    TEMP_PASSWORD VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+);
+
+-- -----------------------------------------------------
+-- Table AP_ASSETS
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS AP_ASSETS (
+    ID INT NOT NULL AUTO_INCREMENT,
+    APP_ID INT NULL,
+    TENANT_ID INT NOT NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    ADAM_ID VARCHAR(255) NULL,
+    ASSIGNED_COUNT VARCHAR(255) NULL,
+    DEVICE_ASSIGNABLE VARCHAR(255) NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    PRODUCT_TYPE VARCHAR(255) NULL,
+    RETIRED_COUNT VARCHAR(255) NULL,
+    REVOCABLE VARCHAR(255) NULL,
+    SUPPORTED_PLATFORMS VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+);
+
+-- -----------------------------------------------------
+-- Table AP_VPP_ASSOCIATION
+-- -----------------------------------------------------
+
+CREATE TABLE IF NOT EXISTS AP_VPP_ASSOCIATION (
+    ID INT NOT NULL AUTO_INCREMENT,
+    ASSET_ID INT,
+    USER_ID INT,
+    TENANT_ID INT NOT NULL,
+    ASSOCIATION_TYPE VARCHAR(255) NOT NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    PRIMARY KEY (ID),
+    CONSTRAINT AP_VPP_ASSETS_fk FOREIGN KEY (ASSET_ID) REFERENCES AP_ASSETS (ID) ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT AP_VPP_VPP_USER_fk FOREIGN KEY (USER_ID) REFERENCES AP_VPP_USER (ID) ON DELETE CASCADE ON UPDATE CASCADE
+);

features/application-mgt/io.entgra.device.mgt.core.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/oracle.sql

@@ -420,3 +420,52 @@ CREATE TABLE IF NOT EXISTS AP_APP_FAVOURITES(
     REFERENCES AP_APP (ID)
 )
 /
+
+CREATE TABLE AP_VPP_USER (
+    ID number GENERATED BY DEFAULT AS IDENTITY(START WITH 1) NOT NULL,
+    CLIENT_USER_ID VARCHAR2(255) NULL,
+    DM_USERNAME VARCHAR2(255) NOT NULL,
+    TENANT_ID INT NOT NULL,
+    EMAIL VARCHAR2(255) NULL,
+    INVITE_CODE VARCHAR2(255) NULL,
+    STATUS VARCHAR2(255) NULL,
+    CREATED_TIME NUMBER(19) NULL,
+    LAST_UPDATED_TIME NUMBER(19) NULL,
+    MANAGED_ID VARCHAR2(255) NULL,
+    TEMP_PASSWORD VARCHAR2(255) NULL,
+    PRIMARY KEY (ID)
+)
+/
+
+CREATE TABLE AP_ASSETS (
+    ID number GENERATED BY DEFAULT AS IDENTITY(START WITH 1) NOT NULL,
+    APP_ID INT NULL,
+    TENANT_ID INT NOT NULL,
+    CREATED_TIME NUMBER(19) NULL,
+    LAST_UPDATED_TIME NUMBER(19) NULL,
+    ADAM_ID VARCHAR2(255) NULL,
+    ASSIGNED_COUNT VARCHAR2(255) NULL,
+    DEVICE_ASSIGNABLE VARCHAR2(255) NULL,
+    PRICING_PARAMS VARCHAR2(255) NULL,
+    PRODUCT_TYPE VARCHAR2(255) NULL,
+    RETIRED_COUNT VARCHAR2(255) NULL,
+    REVOCABLE VARCHAR2(255) NULL,
+    SUPPORTED_PLATFORMS VARCHAR2(255) NULL,
+   PRIMARY KEY (ID)
+)
+/
+
+CREATE TABLE AP_VPP_ASSOCIATION (
+    ID number GENERATED BY DEFAULT AS IDENTITY(START WITH 1) NOT NULL,
+    ASSET_ID INT,
+    USER_ID INT,
+    TENANT_ID INT NOT NULL,
+    ASSOCIATION_TYPE VARCHAR2(255) NOT NULL,
+    PRICING_PARAMS VARCHAR2(255) NULL,
+    CREATED_TIME NUMBER(19) NULL,
+    LAST_UPDATED_TIME NUMBER(19) NULL,
+    PRIMARY KEY (ID),
+    CONSTRAINT AP_VPP_ASSETS_fk FOREIGN KEY (ASSET_ID) REFERENCES AP_ASSETS (ID) ON DELETE CASCADE,
+    CONSTRAINT AP_VPP_VPP_USER_fk FOREIGN KEY (USER_ID) REFERENCES AP_VPP_USER (ID) ON DELETE CASCADE
+)
+/

features/application-mgt/io.entgra.device.mgt.core.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/postgresql.sql

@@ -352,3 +352,58 @@ CREATE TABLE IF NOT EXISTS AP_APP_FAVOURITES(
     FOREIGN KEY (AP_APP_ID)
     REFERENCES AP_APP (ID) ON DELETE NO ACTION ON UPDATE NO ACTION
 );
+
+-- -----------------------------------------------------
+-- Table AP_VPP_USER
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS AP_VPP_USER (
+    ID INTEGER NOT NULL DEFAULT NEXTVAL('AP_VPP_USER_seq'),
+    CLIENT_USER_ID VARCHAR(255) NULL,
+    DM_USERNAME VARCHAR(255) NOT NULL,
+    TENANT_ID INTEGER NOT NULL,
+    EMAIL VARCHAR(255) NULL,
+    INVITE_CODE VARCHAR(255) NULL,
+    STATUS VARCHAR(255) NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    MANAGED_ID VARCHAR(255) NULL,
+    TEMP_PASSWORD VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+    );
+
+-- -----------------------------------------------------
+-- Table AP_ASSETS
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS AP_ASSETS (
+    ID INTEGER NOT NULL DEFAULT NEXTVAL('AP_ASSETS_seq'),
+    APP_ID INTEGER NULL,
+    TENANT_ID INTEGER NOT NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    ADAM_ID VARCHAR(255) NULL,
+    ASSIGNED_COUNT VARCHAR(255) NULL,
+    DEVICE_ASSIGNABLE VARCHAR(255) NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    PRODUCT_TYPE VARCHAR(255) NULL,
+    RETIRED_COUNT VARCHAR(255) NULL,
+    REVOCABLE VARCHAR(255) NULL,
+    SUPPORTED_PLATFORMS VARCHAR(255) NULL,
+    PRIMARY KEY (ID)
+    );
+
+-- -----------------------------------------------------
+-- Table AP_VPP_ASSOCIATION
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS AP_VPP_ASSOCIATION (
+    ID INTEGER NOT NULL DEFAULT NEXTVAL('AP_VPP_ASSOCIATION_seq'),
+    ASSET_ID INTEGER,
+    USER_ID INTEGER,
+    TENANT_ID INTEGER NOT NULL,
+    ASSOCIATION_TYPE VARCHAR(255) NOT NULL,
+    PRICING_PARAMS VARCHAR(255) NULL,
+    CREATED_TIME BIGINT NULL,
+    LAST_UPDATED_TIME BIGINT NULL,
+    PRIMARY KEY (ID),
+    CONSTRAINT AP_VPP_ASSETS_fk FOREIGN KEY (ASSET_ID) REFERENCES AP_ASSETS (ID) ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT AP_VPP_VPP_USER_fk FOREIGN KEY (USER_ID) REFERENCES AP_VPP_USER (ID) ON DELETE CASCADE ON UPDATE CASCADE
+    );