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I am building a multi-platform application on android and IOS, my app was rejected because I did not implement apples in-app purchase. My issue is that users that Purchase from an Android device should still have an active subscription if they get an IOS phone, or access the product via the web browser.Currently, I have implemented a third party (STRIPE) to process the subscriptions, however, apple has rejected our code and directed us to use the apple in-app purchase functionality.As you can imagine this causes a lot of headaches if the user wants to use Web or Android moving forward for purchase.