def METHOD_NAME(self):
    data = {
        "grant_type": "client_credentials",
        "client_id": self._access_token_client_id,
        "client_secret": self._access_token_client_secret,
    }
    r = self._session.post(
        self._access_token_url, data=data, timeout=REQUEST_TIMEOUT_SEC
    )
    r.raise_for_status()
    self._access_token = r.json().get("access_token")