When testing In-App Purchasing API (2) in the Amazon App Tester, there are three Amazon Users presented in the User Account Settings (Amazon User 1, Amazon User 2, Amazon User 3). Each has a different underlying Amazon User Id.
My question is: is there any way (perhaps through the .json file?) to either add more user accounts to the app or else change the underlying amazon user id, so there would be more than just three to test with?