How to use an Apple Card for payment on iphone
How do I use my Apple Card to use as payment method on iPhone?
iPhone 11 Pro
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You can use it in Apple Pay in the same way that you would use Apple Pay to pay with other credit cards or debit cards. See: Make purchases using Apple Pay - Apple Support
If Apple Card is not already in your Wallet, see: How to add Apple Card to your Apple devices - Apple Support