@Ankur Bawiskar 

Yes, it runs from the script background without issue.

If the script is proven to be functional, then as long as I'm passing in a "response" to begin with then it should work.

I know that the test_user has both read and write access to the endpoint and target table because I'm able to successfully see a response with all needed information.

Any ideas on why, when running via Business Rule, my response may be coming back Null/Blank?