Hello, PaoloGi I'm also have this question that's why I searched and find this thread. It's seem not really answered what Ravi1207 asking. But Thanks, I got a good picture here. If you build and deploy the app in the device directly from a mac with Xcode then the payment api will take the sandbox tester you have on the client. --> Yes, this is clear. Developer can check the Transaction in Sandbox account. If you get the app from TestFlight then the payment api will take the main account of the client. --> Understand the behavior for TestFlight which will link the payment api to main account of the client. In this case, how to check the Transaction ? I check the main account subscription. It didn't show the TestFlight purchase transaction.