request method and refresh_token, get rapt token.

    Args:
        request (google.auth.transport.Request): A callable used to make
            HTTP requests.
        client_id (str): client id to get access token for reauth scope.
        client_secret (str): client secret for the client_id
        refresh_token (str): refresh token to refresh access token
        token_uri (str): uri to refresh access token
        scopes (Optional(Sequence[str])): scopes required by the client application

    Returns:
        str: The rapt token.
    Raises:
        google.auth.exceptions.RefreshError: If reauth failed.
    z