Hi azeem202,
Welcome to the Apple Community.
Apple support has an article online that may help:
"Set up Apple Pay in Wallet on iPhone"
says:
Add a credit or debit card
- In Wallet, tap
. You may be asked to sign in with your Apple ID. - Choose one of the following:
- In Wallet, tap
- Previous cards: Choose the card associated with your Apple ID, cards you use with Apple Pay on your other devices, or cards that you removed. Tap Continue, then enter the CVV number of each card.
- Debit or credit card: Position iPhone so that your card appears in the frame, or enter the card details manually.
- Transit card: Enter a location or card name, or scroll down to see transit cards in your area.
Alternatively, you may be able to add your card from the app of the bank or card issuer.
The card issuer determines whether your card is eligible for Apple Pay, and may ask you for additional information to complete the verification process.
Here's the complete article: https://support.apple.com/en-au/guide/iphone/iph9b7f53382/ios
If needed:
If you can't add a card to Apple Wallet to use with Apple Pay
https://support.apple.com/en-us/HT205630
or
There is a "Get support" link to Apple at top right on this discussion page.
All the best :-)