Unable to update Apple ID payment method
"Credit card number is invalid"
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Did you enter the number correctly?
Review this document about what to do "If your payment method is declined in the App Store or iTunes Store" Click here --> Make sure this is a payment method that you can use with your Apple ID; click here --> https://support.apple.com/HT202631 For most people this means a card from the same country as the store you are using.
If you still have problems Click here --> https://support.apple.com/choose-country-region/ Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world." - https://support.apple.com/HT201232