I've deleted the Google Pay app but can still make payments. Why?
Google Pay stores your Virtual Account Number on the phone. 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 Goggle Pay Terms and Conditions that you keep the Google Pay app installed on your phone so that you can receive the Google Pay Transaction Receipt.