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I have some features which would be unlocked only after the purchase through in app purchase.
Is it fine if I store the flag value in NSUserDefaults to check whether app has been purchased or not?
Is it safe to store the flag in NSUserDefaults once purchase is done via In App Purchase?
Yes that is the best way. At lease I stored in NSUSerDefault in my Non-Consumable In-app purchase type.. So it is working as charm for me until now.