Hey 
We’ve created this collection to demonstrate how you can loop over a GET or a POST request while altering the data at each request:
https://www.postman.com/postman/workspace/postman-answers/collection/9215231-25b72aab-2c6a-4941-832d-dd47e142ff2a?ctx=documentation
If you’re logged into your account, you can fork it to your own workspace and try it out directly. 