I use a variation of this:
//inside of an IBaction
[[SKPaymentQueue defaultQueue] addTransactionObserver:self];
[[SKPaymentQueue defaultQueue]restoreCompletedTransactions];
// Then this is called
- (void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue {
NSLog(@"%@",queue );
NSLog(@"Restored Transactions are once again in Queue for purchasing %@",[queue transactions]);
NSMutableArray *purchasedItemIDs = [[NSMutableArray alloc] init];
NSLog(@"received restored transactions: %i", queue.transactions.count);
for (SKPaymentTransaction *transaction in queue.transactions) {
NSString *productID = transaction.payment.productIdentifier;
[purchasedItemIDs addObject:productID];
NSLog (@"product id is %@" , productID);
// here put an if/then statement to write files based on previously purchased items
// example if ([productID isEqualToString: @"youruniqueproductidentifier]){write files} else { nslog sorry}
}
}
Sorry, I’m on my iPad if this makes no sense.