Why is the Apple Store not taking my cards I can’t download free apps
Why can’t I get free Apple when I have tried different cards?
iPad mini, iOS 9
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.