Using Apple Pay with your Westpac Mastercard Debit card
When you add your Westpac Mastercard Debit card to Apple Pay, the card will default to the Mastercard network for payments with Apple Pay.
If you have linked a second account to your Westpac Mastercard Debit card, Apple Pay allows you to select the account you would like the funds to be debited from. Payments made via the Mastercard network are processed by Mastercard in the same manner as other payments on the Mastercard network and are debited from your linked default account. Transactions processed via the eftpos network will be debited to your selected account linked to the selected payment option.