Transaction comes back after finishTransaction: has been called on it

Question

I am using in-app purchase for an iPhone app. I have a class that acts as SKProductsRequestDelegate and SKPaymentTransactionObserver, and it\'s all

Answer 1

I have not delved deeply into this, but I was seeing my calls to finishTransaction reliably failing in iOS 4. On a hunch I put the call to finishTransaction in a dispatch_async call and the problem went away.

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {
  [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
});

Perhaps a salient point is I was calling finishTransaction from within a block which ultimately ran after a network call to my server.