How do I make my Apple Card my apple pay
How do I change my Apple Card to be my apple pay
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The Apple Card is by definition already an option in Apple Pay and can be selected when paying at any time. See the "Pay with a different card..." section here: link-> How to use Apple Pay - Apple Support
If you want to make it the default payment option so its the one selected every time you go to pay, then follow the steps here: link-> Manage the cards that you use with Apple Pay - Apple Support