def METHOD_NAME(self):
    if not hasattr(self, '_auth_args'):
        auth = {
            'access_token': self.access_token
        }
        if self.app_secret is not None:
            appsecret_proof = self.generate_appsecret_proof()
            auth['appsecret_proof'] = appsecret_proof
        self._auth_args = auth
    return self._auth_args