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in app purchase - Ios how to get a list of already purchased products?

I'm building an app that uses In app purchase. I'm using non-consumable product types.

Everything works ok (setting up products, buying...).

What I would like to do is to verify which products a user had already purchased (when reinstalling app or changing device)?

Is that possible?

Thanks

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See the Restoring Transactions section of the In-App Purchase guide. Here is what it specifically says:

Store Kit provides built-in functionality to restore transactions for non-consumable products, auto-renewable subscriptions and free subscriptions. To restore transactions, your application calls the payment queue’s restoreCompletedTransactions method. The payment queue sends a request to the App Store to restore the transctions. In return, the App Store generates a new restore transaction for each transaction that was previously completed.


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