Your payment method was declined
Your payment method was declined.update your payment method. How to fix this
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iPhone 7
Question marked as
Change your payment method to a valid card : Change, add, or remove Apple ID payment methods - Apple Support
For a card to have a chance of being accepted it needs to be registered to the same name and address (including format and spacing etc.) that you have on your iTunes account, and have been issued by a bank in the country where you are (and therefore the country which is on your iTunes account).