Hello apple_user444,
We understand that you're having an issue with adding your card to Apple Wallet to use with Apple Pay. By chance, have you tried using another card? If so, do you experience the same behavior?
To ensure that we're covering all of our bases, we'd like to provide you with a few steps that may help resolve the issue:
1. Check that you're able to use Apple Pay:
• Contact your card issuer to see if they support Apple Pay.
• Update to the latest version of iOS or iPadOS, watchOS, or macOS.
• Make sure that you are in a supported country or region.
• Check that your device is compatible with Apple Pay.
2. Check for services outages or connection issues.
3. If you see the message "Could Not Add Card" or "Invalid Card," contact your bank or card issuer.
Apple does not approve or decline cards for use with Apple Pay. If your card was declined, contact your bank or card issuer.
If you need help adding a card, learn how to set up Apple Pay.
Click here for more details: If you can't add a card to Apple Wallet to use with Apple Pay
Let us know if this helps.
Best wishes.