I've deleted the Google Pay app but can still make payments. Why?
Google Pay stores your Virtual Account Number on the device. It is the Virtual Account Number which is used to process transactions rather than the Goggle Pay app.
The Google Pay app is used to manage your cards and provide the Google Pay Transaction Receipt. It is a term of the Westpac Google Pay Terms and Conditions that you keep the Google Pay app installed on your device so that you can receive the Google Pay Transaction Receipt.
To remove the ability to make payments from your device, you must reinstall the Google Pay app and remove the card from the app or go to Settings > Connections NFC and Contactless Payments > Contactless Payments > Disable Google Pay.
See Google Pay Help Center for more information.