SeacoastSon Said:
"Apple Wallet: Can’t get valid credit card to work in Apple wallet even after I signed out of my Apple ID, signed back in and re-added the credit card which was deleted by signing out. I closed the phone and rebooted. IOS is fully up to date."
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Successfully Modifying a Method of Payment:
A. Use a Computer:
Have a computer available to perform this? If so, use a computer to perform this, as it would be more user-friendly doing so.
B. Refer to this Link: Change, Add, or Remove Apple ID Payment Methods - Apple Support