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Restore in-app purchases for different app accounts

I’m implementing in-app purchases (non-consumable) to my iOS app, and I’m stuck with restore purchases. When a user registers in my app, I create a user account (A) on my server. After the user buys an in-app purchase, I need to tie the account and iIAP (A+IAP). The question is - what if the user creates a new user account (A1) and restores the IAP? Will it unlock premium content for another user? (A1+IAP). If yes, how to fix that?

Server-side receipt validation for ios in-app purchases

I use a client-side receipt validation for my app and want to move to the server-side receipt validation to check permissions and provide access to my premium content from the server. What is the best way to do that?

The project id used to call the Google Play Developer API has not been linked in the Google Play Developer Console

Hey Guys, i was trying to deploy my app from an external service called Codemagic. I'm a developer and trying out some stuff. My current problem is that i have two apps in the playconsole. And to use the API i have to link it to one project. But how can I give API access to my second app. I'm trying now for days and still can't fix this problem. It always tells me that my projectId is not linked. 😭 i've seen there are more people facing this problem. but these solution don't describe how to link TWO projects