Hello, Kulchase.
You can change your default card, remove a card from Apple Wallet, or update the billing and contact information that Apple Pay uses for in-app and online purchases. Follow these steps to change this on your iPhone:
- Open the Wallet app.
- Touch and hold the payment card that you want to set as your default card.
- Drag the card in front of your other cards.
That way, you can make sure the card you want to be charged is charged first. This is explained in further detail here: Change or remove the payment cards that you use with Apple Pay. Let us know if we can help with anything else at all or if this doesn't settle your issue. Thanks and have a fabulous day!