How to add my debit card to Apple Wallet?

This article will help you add bank cards to wallet

Set up Apple Pay – Apple Support (UK)

See also

Apple Pay or Wallet not available

See this list of valid countries for Apple Pay

Countries and regions that support Apple Pay – Apple Support (UK)

Apple Pay - if some cards do not work

Banks that support Apple Pay…

If a payment card that you use with Apple Pay doesn't work – Apple Support (UK)

 and

Reasons your payment card may be declined

1.            Account suspended for suspected fraud.

2.            Address in your iTunes account does not match exactly the billing address for the card

3.            Error in credit card number

4.            Insufficient balance or you still owe money on a subscription

5.            The card was not issued in the country of the iTunes store

6.            Wrong expiration date

7.            Wrong security (CVV) code

8.            You are connected through a VPN provider that makes iTunes think you live elsewhere - uninstall VPN

9.            You live  in India

About billing for Apple subscriptions and media products in India – Apple Support (UK)

10.        You live in Russian Federation or use Russian banks or cards