There is 2 things you have to do to send this back.
1. Setup the source to be from Mapping or Destination node
![](https://www.qvera.com/kb/?qa=blob&qa_blobid=5718177732705543606)
2. Setup the ack script on the Destination to go to post the response: Here is a sample script. The line that returns the ack is "qie.postMessageResponse(response);"
if (response === null || response.length === 0) {
![](https://www.qvera.com/kb/?qa=blob&qa_blobid=5665195922100967521)