But then does the developer now need to track this list of production test cards and make sure the application doesn’t enact some other logic based on the test

But then does the developer now need to track this list of production test cards and make sure the application doesn’t enact some other logic based on the test purchase? I mean really, you can get 99.9% of the way there with the test cards in the sandbox, and then give the thing a smoke test in production when you’re ready.