Dear @LeenaJaIN , As you mentioned you have already tested api response using fdm read service. So there can't be problem in rest API. But when you created an AuthID input parameter in adaptive form then some rules can be set by invoking the required service and setting up the correct output elements. This will prefill your adaptive form elements based on AuthId entered from rest API. Please go through this article as i found this helpful.https://medium.com/adobetech/using-external-data-sources-...