For iPhone or iPad:

Wallet App
  • Open the Wallet app, then tap and hold the card
  • Drag it to the front and release. Tap 'OK'
  • You will receive a notification confirming your new default card setting.
  • Go to 'Settings' > 'Wallet & Apple Pay'
  • Scroll down to 'Transaction Defaults'
  • Tap 'Default Card', then choose a new card

For Apple Watch:

  • On your iPhone open the Apple Watch app
  • Tap 'My Watch' tab
  • Tap 'Wallet & Apple Pay'
  • Tap 'Default Card'.