I am currently testing In-App Billing for a future app, and after I successfully \"bought\" the test item \"android.test.purchased\" the first time, I now receive the respon
This is the difference between consumable and non-consumable items; non-consumable items (what you seem to be dealing with here) have their state tracked persistently, while consumable items can be purchased multiple times. You'll have to go into your Play management console and cancel/refund the sale to test it again.