Apple Pay Wallet add my debit card?

Set up Apple Pay in Wallet on iPhone - Apple Support:

Add a credit or debit card:  

Set up Apple Pay in Wallet on iPhone - Apple Support

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Hope this is helpful. 

Have a great day !

See if either of the following articles can help:

• If you can't add cards to Wallet to use Apple Pay - Apple Support
• Countries and regions that support Apple Pay - Apple Support