Mastercard’s Automatic Billing Updater (ABU) is a new feature designed to automatically update replacement* card details for recurring payments you make with your credit or debit card. It will also update any card details you have stored on any apps or at any online stores.

Things you should know. 

*Replacement card details are those cards which have expired or have been replaced for another Westpac product. If your card is replaced due to fraud, being lost or stolen, ABU would not be available.