Can l change the default card?

Yes. For instructions for changing the default card for Apple Pay, see the following from: Change or remove the payment cards that you use with Apple Pay - Apple Support

How to change the default card for Apple Pay on your iPhone

1. Open the Wallet app.
2. Touch and hold the payment card that you want to set as your default card.
3. Drag the card in front of your other cards.

How to change the default card for Apple Pay on your Apple Watch

1. On your iPhone, open the Apple Watch app.
2. In the My Watch tab, tap Wallet & Apple Pay.
3. Under Transaction Defaults, tap Default Card.
4. Tap a card to set it as your default card.

How to change the default card for Apple Pay on your Mac or iPad

1. On your device, open Apple Wallet settings.

• • On your Mac with Touch ID, go to System Settings (or System Preferences) > Wallet & Apple Pay.
  • On your iPad, go to Settings > Wallet & Apple Pay.

1. Select a new default card.

• • On your Mac with Touch ID, choose a card from the menu.
  • On your iPad, scroll down to Transaction Defaults > tap Default Card and choose a card.