diff --git a/src/main/java/org/gcube/portal/ddas/DdasVREService.java b/src/main/java/org/gcube/portal/ddas/DdasVREService.java
index 4d7a65b..5cfc134 100644
--- a/src/main/java/org/gcube/portal/ddas/DdasVREService.java
+++ b/src/main/java/org/gcube/portal/ddas/DdasVREService.java
@@ -6,6 +6,7 @@ import java.io.BufferedReader;
 import java.io.IOException;
 import java.net.URL;
 import java.util.Base64;
+import java.util.UUID;
 
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
@@ -57,28 +58,41 @@ public class DdasVREService extends HttpServlet {
 		} catch (Exception e) {
 			_log.error("Error parsing JSON request string", e);
 		}
-
+		Gson gson = new Gson();
 		BrokerResponse theResponse = null;
-		String requestId = jsonObject.get("request_id").getAsString();
-		if (requestId == null || requestId.equals("")) {
+		String requestId = null;
+		try {
+			requestId = jsonObject.get("requestId").getAsString();
+			if (requestId == null || requestId.equals("")) {
+				theResponse = new BrokerResponse(405, "Method Not Allowed, something is wrong in the JSON, request_id not found", null);
+			}
+		} catch (NullPointerException ex) {
+			_log.error("Error parsing JSON request string, request_id paarm not found");
 			theResponse = new BrokerResponse(405, "Method Not Allowed, something is wrong in the JSON, request_id not found", null);
+			String toReturn = gson.toJson(theResponse); 
+			response.setContentType("application/json");		
+			response.getWriter().write(toReturn); 
+			return;
 		}
+
 		_log.debug("GOT JSON");
 		_log.debug("JSON="+jsonObject.toString());
-		boolean result = authorizeRequest(requestId, jsonObject);
+
+		String otp = UUID.randomUUID().toString();
+		boolean result = authorizeRequest(otp, jsonObject);
 		if (result) {
 			int status = 200;
 			Base64.Encoder withoutPaddingEncoder = Base64.getEncoder().withoutPadding();
-			String requestIdParam  =  withoutPaddingEncoder.encodeToString("request_id".getBytes());
+			String requestIdParam  =  withoutPaddingEncoder.encodeToString("otp".getBytes());
 			String message = "Started downloading order files to Virtual Research Environment '"+requestId+"'";
-			String vreConfirmUrl = "https://blue-cloud.d4science.org/group/bluecloud-gateway/vre-data-pool?"+requestIdParam+"="+requestId; //redirect URL
+			String vreConfirmUrl = "https://blue-cloud.d4science.org/group/bluecloud-gateway/vre-data-pool?"+requestIdParam+"="+otp; //redirect URL
 			URL theURL = new URL(vreConfirmUrl);
 			theResponse = new BrokerResponse(status, message, theURL);
 		} 
 		else {
 			theResponse = new BrokerResponse(500, "An error occurred in the VRE Service, downlaod not possible", null);
 		}
-		Gson gson = new Gson();
+
 		String toReturn = gson.toJson(theResponse); 
 		response.setContentType("application/json");		
 		response.getWriter().write(toReturn); 
@@ -90,11 +104,11 @@ public class DdasVREService extends HttpServlet {
 	 * @param jsonObject
 	 * @return true if the operations is successful
 	 */
-	private boolean authorizeRequest(String requestId,JsonObject jsonObject) {
+	private boolean authorizeRequest(String expiry_token,JsonObject jsonObject) {
 		OperationFuture<Boolean> writeOp = null;
 		try {
 			MemcachedClient mClient = new DistributedCacheClient().getMemcachedClient();
-			writeOp = mClient.set(requestId, CACHE_SECONDS_EXPIRATION, jsonObject.toString());		
+			writeOp = mClient.set(expiry_token, CACHE_SECONDS_EXPIRATION, jsonObject.toString());		
 			Thread.sleep(500);
 		} catch (Exception e) {
 			e.printStackTrace();