For an iOS game application that has in-app purchases which are considered to be non-consumable (buy once and permanently unlock) when logging onto account A from a different device, a user has the option to restore items purchased, but creating a new game account or multiple accounts what should/shouldn’t be allowed with restoring and what is recommended in this scenario from a dev point of view?
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The purchase and restoring is done by Apple and you can't influence that. If the user click restore, you don't have to do any check yourself. You make a call so Apple checks if this user has already done the purchase. It means that a user on a new phone can restore using its account, but a user making a new account can't restore. To you it doesn't matter. You show the restore button anyway and let Apple's API tell you what must be restored.
This links contains the Apple guideline for restoring IAP.
