Q: The payment button isn't working, how can I buy it?
A: One of our users had this problem where tapping on the payment buttons did nothing. Apparently this is an Apple bug. To fix it, he changed the iPhone language and then changed it back again.
He writes:
I finally got it to work. Hard restart did nothing. But after reading a forum I tried the bizarre suggestion of changing the language. As soon as I did that multiple purchase pop ups from your app appeared even though it was closed at the time. It was like they were stuck in a stack and got released by changing the language. Really strange. Anyway all purchased now. Thanks for your help
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