Hi guys.Apple is asking me that if a Non-Consumable product has been purchased by a user and the user decides to delete and reinstall the App, then I must present a "Restore" instead than "Buy" button.To check if a product has been purchased I am using NSUserDefaults, like this: public init(productIds: Set<ProductIdentifier>) { self.productIdentifiers = productIds for productIdentifier in productIds { let purchased = NSUserDefaults.standardUserDefaults().boolForKey(productIdentifier) if purchased { purchasedProductIdentifiers.insert(productIdentifier) print("Previously purchased: \(productIdentifier)") } else { print("Not purchased: \(productIdentifier)") } } super.init() SKPaymentQueue.defaultQueue().addTransactionObserver(self) }But, if the user deletes the App, this information is lost.So, Is there anyway to ask to SKPayment if a product has been purchase? I guess there is because they are asking me that. But I didnt find it.