Default card?
How do I change the default card in wallet for an Apple Subscription in Apple Pay?
Question marked as
Hello
You will change the default payment method linked to your Apple ID to change what card is used for Apple and app subscriptions / purchases. Please read - If you need to change or update your Apple ID payment method - Apple Support.
If you mean specifically for Apple Pay, you can read - Change or remove the payment cards that you use with Apple Pay - Apple Support.
I hope this helps!