payment method declined
Why is my payment method (master card) being declined?
Question marked as
Start here, see -> Payment methods you can use with your Apple ID
Payment methods you can use with your Apple ID – Apple Support (UK)
fyi: Not all credit & debit cards seem to work with App Store / iTunes Store, try a different one, or preferably a credit card.
If your card is not accepted as a paymenf method, you need to contact your bank.