How does Google Pay work?
To use Google Pay for purchases, you must first add your eligible card on your NFC-enabled Android device. See the Getting Started section of the FAQs for details on how to verify your card.
Once your card has been added and your identify verified, simply place your device on a contactless payment terminal to make a purchase. Your device will need to be turned on and the screen "awake".
Adding your card to Google Pay will also add your card to Google Payments. This will allow you to use your card to make purchases in the Google Play Store and online with Google. For further information on Google Payments, see pay.google.com/about.