Hi @Ram So ADF doesn't support JWT or 3 Legged OAuth based authentication, it only supports Basic Auth so make sure your RingCentral App is created to use basic password flow based auth.

As far as correctly formatting the JSON POST Request, refer to our API Reference tool https://developers.ringcentral.com/api-reference/Line-Of-Business-Analytics/aggregatePerformanceReportCalls that helps you interactively structure the request and then you can follow this tutorial to connect and consume the same in ADF https://www.youtube.com/watch?v=jjJyY8b6pxI

Hope this helps.