I'm working on an app the has implemented inapp purchases. They have been working so far, and they keep working currently.
But just a couple of days ago, a specific user sent us a support ticket stating that when he purchases and item the bank charges it for the purchase, but within the app, the purchase fails and he doesn't receive the item.
He sent us screenshots showing:
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The iOS native modal when a purchases has been finished correctly ("You're all set - Your purchase was successful ").
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Right after that modal, the app shows an internal modal showing "The purchase failed, please, try again later".
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Checking the app logs, that failure modal was triggered by "The operation couldn’t be completed. (StoreKit.StoreKitError error 1.)".
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Reading docs about this error leads me to think about device or user restrictions (parental controls, usage limits, etc...). It seems that in theses cases the bank charge could be issued but refunded later once Apple ultimately declines the purchase.
However the user says that he doesn't have any kind of restriction. The only related thing is a "this device is also restricted by a profile" message, but everyone seems to have this message.
What could it be causing this issue? In what scenariowould the app show a native OK modal but a storekit error 1?
I'm pretty sure the app is well configured because I keep receiving purchases of all kind, from different users with any problem.