Show device identifier and changeed to delete certificate using Id

                     required = false,
-                    defaultValue = "5")
-            @QueryParam("limit") int limit,
+                    defaultValue = "0")

+                    name = "username",
+                    value = "User name of the certificate added user" ,
+                    required = false,
+                    defaultValue = "0")

-            @QueryParam("offset") int offset,
-            @QueryParam("limit") int limit,
-            @HeaderParam("If-Modified-Since") String ifModifiedSince) {
+            @QueryParam("serialNumber") String serialNumber, @QueryParam("deviceIdentifier") String deviceIdentifier,

         CertificateManagementService certificateService = CertificateMgtAPIUtils.getCertificateManagementService();
+        CertificatePaginationRequest request = new CertificatePaginationRequest(offset, limit);
+
+        if (serialNumber != null && !serialNumber.isEmpty()) {

+                                        serialNumber + "' has been removed").build();
+                    }
+                } catch (CertificateManagementException e) {
+                    String msg = "Error occurred while converting PEM file to X509Certificate";

-                return Response.status(Response.Status.OK).entity(
-                        "Certificate that carries the certificate id '" +
-                                certificateId + "' has been removed").build();
+                return Response.status(Response.Status.NOT_FOUND).entity(

-                        certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
-                    }
-                }
+            StringBuilder queryBuilder = new StringBuilder("SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?");

+
+            String sql = queryBuilder.toString();
+
+            stmt = conn.prepareStatement(sql);

+            query += "ORDER BY ID LIMIT ?,?";
 
-            int resultCount = 0;
+            stmt = conn.prepareStatement(query);

-            int resultCount = 0;
+            query += "ORDER BY ID OFFSET ? ROWS FETCH NEXT ? ROWS ONLY";
+
+            stmt = conn.prepareStatement(query);

+
+            String sql = queryBuilder.toString();
+
+            stmt = conn.prepareStatement(sql);

-            int resultCount = 0;
+            query += "ORDER BY ID LIMIT ? OFFSET ?";
+
+            stmt = conn.prepareStatement(query);

+                queryBuilder.append(" AND USERNAME ILIKE ?");
+            }
+
+            String sql = queryBuilder.toString();

-            int resultCount = 0;
+            query += "ORDER BY ID OFFSET ? ROWS FETCH NEXT ? ROWS ONLY";
+
+            stmt = conn.prepareStatement(query);

-                        certificateCount = rs.getInt("DEVICE_CERTIFICATE_COUNT");
-                    }
-                }
+            StringBuilder queryBuilder = new StringBuilder("SELECT COUNT(*) AS DEVICE_CERTIFICATE_COUNT FROM DM_DEVICE_CERTIFICATE WHERE TENANT_ID = ?");

+
+            String sql = queryBuilder.toString();
+
+            stmt = conn.prepareStatement(sql);

  */
 package io.entgra.device.mgt.core.certificate.mgt.core.service;
 
+

+            metadata = CertificateManagerUtil.getMetadataManagementService().retrieveMetadata(CertificateManagementConstants.CERTIFICATE_DELETE);
+            if (metadata != null) {
+                String metaValue = metadata.getMetaValue();
+                if (metaValue != null && !metaValue.isEmpty()) {