code: def verify_firebase_token(id_token, request, audience=None):
      
      return verify_token(
          id_token, request, audience=audience, certs_url=_GOOGLE_APIS_CERTS_URL)
docs: Verifies an ID Token issued by Firebase Authentication.
  
      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. This is
              typically your Firebase application ID. If None then the audience
              is not verified.
  
      Returns:
          Mapping[str, Any]: The decoded token.