Restoring subscribed purchase for Auto-Renewable Subscriptions

Question

When I purchase a previously purchased "Auto-Renewable Subscriptions" in my app, it said

You're currently subscribed to this...

When I clicked the OK, in the delegate of the payment queue..

- (void) paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
    for (SKPaymentTransaction * transaction in transactions)
    {
        switch (transaction.transactionState)
        {
            case SKPaymentTransactionStatePurchased:
                [self completeTransaction:transaction];
                break;
            case SKPaymentTransactionStateFailed:
                [self failedTransaction:transaction]; // Why this is called?
                break;
            case SKPaymentTransactionStateRestored:
                [self restoreTransaction:transaction];
            default:
                break;
        }
    }
}

The transaction.transactionState returned is SKPaymentTransactionStateFailed instead of SKPaymentTransactionStateRestored, is it normal?

So how do I handle this correctly?

Answer 1

I have the same issue and I don't think there's any way to distinguish this event from other errors (it returns error code SKErrorPaymentCancelled). I think the only way you can handle it is by having a "Restore Purchases" button, and call [[SKPaymentQueue defaultQueue] restoreCompletedTransactions] when the user presses it.

Answer 2

Actually, you can't determine if the user is already subscribed. You should have Subscribe button that new users use to subscribe, and Restore button for already subscribed users.

And when you get SKPaymentTransactionStateFailed you can show a message that suggests to use Restore button in case the user is already subscribed.