Vfrdtyky

I'm looking for a way to link an in-app purchase (non-renewable subscription) to the user apple account, because my app doesn't have account system, and obviously I want the user to keep his subscription.

I read that we can't get the Apple ID, but I think there is a way to do it because most of iOS apps can save datas with your Apple account.

Thanks for your answers.

If you don't have your own account system (where the user can login etc), you can check the user's purchases for your app from the purchase receipt:

https://developer.apple.com/library/ios/releasenotes/General/ValidateAppStoreReceipt/Introduction.html

Getting personal information like AppleID etc is not possible from the SDK.

You should keep track of already purchased products in your app yourself. I usually use [[NSUserDefaults standardUserDefaults] setBool:YES forKey:productIdentifier] for this.

The problem arises when your users reinstalls your app or buys a new device. In this case you must implement a way to restore the purchased products.

The In-App Purchase Programmering Guide states that one way to implement this is by calling [[SKPaymentQueue defaultQueue] restoreCompletedTransactions]. This sends a request to the App Store to restore all of your app’s completed transactions.

Then paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions of your transaction observer will be called and transactions holds the restored products. My function usually looks something like this:

- (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];

                break;

            case SKPaymentTransactionStateRestored:

                [self restoreTransaction:transaction];

            default:

                break;

        }

    };

}`

Complete the restoration process (providing content, update NSUserDefaults etc.) in restoreTransaction.

For non-renewal subscription you have to manually store the expiry date somewhere because Apple does not manages it for non-renewal.

I had implemented this feature in one of my application where after subscription I used to store the expire date on server and app will check for expire date while accessing paid features.

If found expired, app will ask to purchase subscription again.

Reference link:
https://developer.apple.com/library/mac/documentation/LanguagesUtilities/Conceptual/iTunesConnectInAppPurchase_Guide/Chapters/CreatingInAppPurchaseProducts.html#//apple_ref/doc/uid/TP40013727-CH3-SW1

https://www.progressconcepts.com/blog/non-renewing-subscription-app-purchases-ios/

Hope this helps.