paymentQueueRestoreCompletedTransactionsFinished: vs updatedTransactions: - ios

Question

I am restoring completed transactions (recurring) with
[[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
and in
- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
I got a list of history transactions restored, made by the app, but the method:
- (void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue
is not even called once, so I wonder which one should I use? I did some research and found that updatedTransactions: method should be used with checking transaction state, but if I got a list of transactions restored, it is just meaningless to treat them all as transactions. Which one should I use? Does paymentQueueRestoreCompletedTransactionsFinished only gives me the latest one (ie sandbox subscription expires in several minutes and I got a full list of history transactions made when testing, in updatedTransactions).

Answer 1

There is an excellent WWDC Video about using StoreKit, it is WWDC2012 Session 302.
To isolate each purchase, your updatedTransactions method could look something like this:
- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {
for (SKPaymentTransaction *transaction in transactions) {
switch(transaction.transactionState) {
case SKPaymentTransactionStatePurchased:
// Unlock content
//... Don't forget to call `finishTransaction`!
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
break;
case SKPaymentTransactionStatePurchasing:
// Maybe show a progress bar?
break;
case SKPaymentTransactionStateFailed:
// Handle error
// You must call finishTransaction here too!
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
break;
case SKPaymentTransactionStateRestored:
// This is the one you want ;)
// ...Re-unlock content...
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
break;
}
}
}
Once you've determined that the purchase is being restored, you can make content available as you see fit - preferably by calling a separate method from within that switch statement and passing the transaction as a parameter. The implementation is up to you of course.

Answer 2

Call [[SKPaymentQueue defaultQueue] addTransactionObserver:self] in (void)viewDidLoad or equivalent if applicable.
Then call [[SKPaymentQueue defaultQueue] restoreCompletedTransactions].
(void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions will be called accordingly through (2).
If you don't call the method in (1), the application will never reach (3) to restore transactions in the first place.

Answer 3

I had this same issue with paymentQueueRestoreCompletedTransactionsFinished never getting called. I fixed by going to iTunes & Aoo Stores in Settings and logged out of the sandbox test account and tried it again. Worked as expected the next time after being prompted to login again on a restore.

Answer 4

From the Apple Docs:
paymentQueueRestoreCompletedTransactionsFinished: This method is called
after all restorable transactions have been processed by the payment
queue. Your application is not required to do anything in this method.