How do I select which card I want as my default payment
How do I select which payment method as my default for payment?
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Default for payment when using Apple Pay? See the "Change your default card" section of Change or remove the payment cards that you use with Apple Pay - Apple Support
Default payment method for your Apple ID? See the "Add a payment method" instructions in Add a payment method to your Apple ID - Apple Support but instead of adding a payment, use Edit and move the one you want to be a default to the top of the list.