Ensure you have the Google Pay app downloaded on your device. For details on where to get the app head here.
On your Android phone: Open the Google Pay app and follow the setup instructions. When you’re asked to, add your Visa card. You may be asked to set up a screen lock on your Android device. Google Pay works with PIN, pattern, password, fingerprint, or retina scanning screen locks. It won’t work with screen locks like Smart Unlock or Knock to Unlock. You’ll need to make sure NFC is enabled on your device. Your phone must also have HCE.
On your watch: Open the Google Pay app on your smart watch. Tap Get Started, and if you need to, set up your screen lock for security. Follow the instructions on your phone to add your Visa to your watch - it’ll only add to your watch, not your phone. Your card is ready to go.