I can’t able to add my card

Hi sineesh240

welcome to the Apple (user-to-user) Community.

Re: "I can’t able to add my card in wallet"

Wondering if you want to add Apple Card to wallet, (How to add Apple Card to your Apple devices - Apple Support

or

you want to add a credit / debit card to Wallet to use for Apple Pay. (How to: Set up Apple Pay - Apple Support )

and

What to do: If you can't add a card to Apple Wallet to use with Apple Pay - Apple Support

NB: Check if Apple Pay is available in your country or region: and, if so, the Apple Pay participating banks

Countries and regions that support Apple Pay - Apple Support

More support if needed:

Apple Pay - Official Apple Support

All the best :-)