How do I change the default payment network?
When you add your Credit or Debit card to Apple Pay, the card will be defaulted to the Visa network for payments with Apple Pay.
To change the payment network on iPhone
-Open the Wallet app,
-tap on your Credit or Debit card
-tap the (***) symbol and choose the network.
-You can also change the payment network prior to tapping your device. Simply, authenticate, choose network on screen, then tap device for payment.
To change the payment network on Apple Watch
-double-click the side button and select your Credit or Debit card
-firmly press the display and choose the network.
https://www.beyondbank.com.au/need-help/how-do-i-change-the-default-payment-network