code: def verify_token(id_token, request, audience=None,
                   certs_url=_GOOGLE_OAUTH2_CERTS_URL):
      
      certs = _fetch_certs(request, certs_url)
  
      return jwt.decode(id_token, certs=certs, audience=audience)
docs: Verifies an ID token and returns the decoded token.
  
      Args:
          id_token (Union[str, bytes]): The encoded token.
          request (google.auth.transport.Request): The object used to make
              HTTP requests.
          audience (str): The audience that this token is intended for. If None
              then the audience is not verified.
          certs_url (str): The URL that specifies the certificates to use to
              verify the token. This URL should return JSON in the format of
              ``{'key id': 'x509 certificate'}``.
  
      Returns:
          Mapping[str, Any]: The decoded token.