Question

I watched tutorials about verifying in app purchases receipt and one thing is still in my mind: I already got the functions that checks if the receipts are valid or not and its working but what I am afraid of if there is a problem with my server some day and someone purchases the app and the receipt will be invalid although it should be valid and it will charge money from him and than tell him that a problem has occurred with the receipt and won’t provide him the content.So in what function should I check the receipt? (I want it to check before it charges the money and if its invalid so it won’t)
thanks.

Answer 1

I just did it in the

- (void)completeTransaction:(SKPaymentTransaction *)transaction

function