My card details have been removed from the Google Pay app. Why?

As an additional security measure, Google may remove your card from Google Pay if:

• Your device has not had network connectivity for a considerable period of time; or
• You have removed the security control used to access your device (e.g screen lock, passcode or biometric identifier)
• The card issuer has revoked the Google Pay service for your card or removed the card eligibility\

Refer to Google Help Center for more details.