If you lose a phone or watch associated with Google Pay, you will need to sign in to your Google Account via another device as soon as possible and disconnect or delete the lost device from your Google Pay account. This is important to prevent that no one will misuse your phone for payments via your digital wallet.
Via "Find my device" you can track your device and lock it.
Using Android Device Manager (www.google.com/android/devicemanager), you can find, lock, and delete the contents of your mobile device.
You do not need to block your card in the P.F.C. app, as Google Pay does not store your card details.