iOS 12 IAP Sandbox

Question

I was watching this WWDC18 talk, and they\'ve explicitly announced that they\'ll allow developers to simultaneously connect one Sandbox Acc

Answer 1

iOS 12.1.2 seems to have simplified the process even further than Jamie's steps without the need to sign-out of anything:

1. While still signed into your phone with your personal Apple ID, open a development app (NOT signed for release)
2. Try to complete an IAP, which brings up the iTunes Store login page
3. Use your sandbox ID here (NOT your personal Apple ID)
4. You may have to log in twice (another popup asks for just your password)
5. The sandboxed purchase should go through
6. Going to Settings > iTunes & App Store and scrolling to the bottom now shows a new Sandbox account that says "This account will be only used for testing your in-app purchases while developing locally. Your existing App Store account will be used for TestFlight apps."

That last bit about TestFlight apps is different than the OP's screenshot. Perhaps this method ONLY sets up the account for development IAP testing, whereas the full sign-out method sets up the sandbox account for more.