Pay
Remove my debit card as default and use credit one card as default temporarily
iPhone 7
Question marked as
See the following from Manage the cards that you use with Apple Pay - Apple Support
Go to Settings > Wallet & Apple Pay on your iPhone or iPad, and scroll down to Transaction Defaults. Tap Default Card, then choose a new card.
On your iPhone, you can also open Wallet, touch and hold a card, then drag it to the front of your cards.