How to add card to Apple wallet?

Things to check:

Countries and regions that support Apple Pay – Apple Support

Devices compatible with Apple Pay – Apple Support

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Apple Support's article : Set up Apple Pay

Says:

"How to add a debit or credit card on your iPhone"

"In the Wallet app, tap the Add button  (+).

Tap Debit or Credit Card to add a new card,

or

Tap Previous Cards to add a card that you used previously.

Tap Continue.

Follow the steps on the screen to add a new card.

Verify your information with your bank or card issuer.

They might ask you to provide more information, or to download an app before approving your card for use with Apple Pay."

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For more support,

if needed:

Try reaching out to Apple Pay Support Staff 

(eg: scroll to the link at bottom right on their website that opens from the link below.)

Apple Pay - Official Apple Support

See a list of Apple phone numbers around the world

Contact Apple for support and service – Apple Support

All the best :-)

Abhi1431 Said:

"Ad card apple wallet"

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Troubleshooting Declined Methods of Payment:

See this Link: If your Payment Method is Declined in the App Store or iTunes Store - Apple Support. Add this using a computer, as it would be more user-friendly doing so.

No success?...

Whom to Contact:

A. Contact Apple Support:

For Financial Assistance, contact Apple Support. These are user-to-user forums. We are not Apple.  Apple barely reads these site on their own time, as it is. As you may suspect, no one here would know the answer to this. So, contact Apple Support. The'll see what has occurred, and will run you through the fix. Here is the information for contacting Apple Support:

Apple Phone Support:

• Contact Us - Choose Locations
• Proceed from there as Necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due do lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

also...

B. Contact your Bank:

• Contact your financial institution (bank) pertaining to this card, as this may be being seen as a scam (though that may not be the case). It would be a matter of security for you as a credit card holder. So, call them, letting them know that all os okay to be followed through with.