tials.refresh(request)

        id_token = credentials.token
        id_token_expiry = credentials.expiry

    Args:
        audience (str): The audience that this ID token is intended for.
        request (Optional[google.auth.transport.Request]): A callable used to make
            HTTP requests. A request object will be created if not provided.

    Returns:
        google.auth.credentials.Credentials: The ID token credentials.

    Raises:
        ~google.auth.exceptions.DefaultCredentialsError:
            If metadata server doesn't exist and no valid service account
            credentials are found.
    zCGOOGLE_APPLICATION_CREDENTIALS path is either not found or invalid.