How can i add my debit card

Re: To add debit card to wallet for use with Apple Pay:

See how to: Set up Apple Pay - Apple Support

Eg: says:

Make sure that you sign in to iCloud on all your devices.

For an iOS device, you need to set up Face ID, Touch ID or a passcode.

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Trouble-shooting if needed:

Which banks support Apple Pay:

Apple Pay participating banks and card issuers in Asia-Pacific - Apple Support

Apple Pay participating banks in Africa, Europe, and the Middle East - Apple Support

Apple Pay participating banks in Canada, Latin America, and the United States - Apple Support

or

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

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More info / support / contact options: Apple Pay Support website: Apple Pay - Official Apple Support