Change otp api to return token

components/device-mgt/org.wso2.carbon.device.mgt.common/src/main/java/org/wso2/carbon/device/mgt/common/spi/OTPManagementService.java

@@ -34,7 +34,7 @@ public interface OTPManagementService {
      * @throws OTPManagementException if error occurs while creating OTP token and storing tenant details.
      * @throws BadRequestException if found and incompatible payload to create OTP token.
      */
-    void sendUserVerifyingMail(OTPWrapper otpWrapper) throws OTPManagementException, DeviceManagementException;
+    String sendUserVerifyingMail(OTPWrapper otpWrapper) throws OTPManagementException, DeviceManagementException;
 
     /**
      * Check the validity of the OTP

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/otp/mgt/service/OTPManagementServiceImpl.java

@@ -78,7 +78,7 @@ public class OTPManagementServiceImpl implements OTPManagementService {
     }
 
     @Override
-    public void sendUserVerifyingMail(OTPWrapper otpWrapper) throws OTPManagementException, DeviceManagementException {
+    public String sendUserVerifyingMail(OTPWrapper otpWrapper) throws OTPManagementException, DeviceManagementException {
         Tenant tenant = validateTenantCreatingDetails(otpWrapper);
         OneTimePinDTO oneTimePinDTO = createOneTimePin(otpWrapper.getEmail(), otpWrapper.getEmailType(),
                 otpWrapper.getUsername(), tenant, -1234);
@@ -90,6 +90,7 @@ public class OTPManagementServiceImpl implements OTPManagementService {
             props.setProperty("otp-token", oneTimePinDTO.getOtpToken());
             sendMail(props, tenant.getEmail(), DeviceManagementConstants.EmailAttributes.USER_VERIFY_TEMPLATE);
             ConnectionManagerUtil.commitDBTransaction();
+            return oneTimePinDTO.getOtpToken();
         } catch (TransactionManagementException e) {
             String msg = "Error occurred while disabling AutoCommit.";
             log.error(msg, e);

components/ui-request-interceptor/io.entgra.ui.request.interceptor/src/main/java/io/entgra/ui/request/interceptor/OTPInvokerHandler.java

@@ -166,7 +166,7 @@ public class OTPInvokerHandler extends HttpServlet {
             throws IOException {
         String schema = req.getScheme();
         apiEndpoint = schema + HandlerConstants.SCHEME_SEPARATOR + System.getProperty(HandlerConstants.IOT_GW_HOST_ENV_VAR)
-                + HandlerConstants.COLON + HandlerUtil.getGatewayPort(schema);
+                + HandlerConstants.COLON + HandlerUtil.getCorePort(schema);
 
         if (StringUtils.isBlank(req.getHeader(HandlerConstants.OTP_HEADER))) {
             log.error("Unauthorized, Please provide OTP token.");