to be consistent with the postman workflow, you should have a pivot request with the aim of synchronously to call many times the other requests, the pivot could have a simple request like “postman-echo.com/get” in order to build the next request on the test script in Postman, the above must set the index value of the iteration to avoid infinity cycle, as show the next image
the calculateFunds post will execute many times through of pivot request, and finally the calculateFunds test script will have to call pivot and eventually using the postman workflow, you don’t mind about the asynchronous callings.