It won’t let me add another card

Hello Kydabest32,

Please make sure your country or region supports Apple Pay - Countries and regions that support Apple Pay - Apple Support.

Furthermore you will need to check if your card and card issuer support Apple Pay and being added to Apple Wallet. That is on the card issuer's end not Apple. Your device will also need to support Apple Pay and should be updated to the most recent version.

Please read - If you can't add a card to Apple Wallet to use with Apple Pay - Apple Support.

I hope this helps!