def METHOD_NAME(self):
    """
    Obtain a temporary request token to authorize an access token and to
    sign the request to obtain the access token
    """
    if self.request_token is None:
        get_params = {}
        if self.parameters:
            get_params.update(self.parameters)
        get_params["oauth_callback"] = build_absolute_uri(
            self.request, self.callback_url
        )
        rt_url = self.request_token_url + "?" + urlencode(get_params)
        oauth = OAuth1(self.consumer_key, client_secret=self.consumer_secret)
        response = requests.post(url=rt_url, auth=oauth)
        if response.status_code not in [200, 201]:
            raise OAuthError(
                _(
                    "Invalid response while obtaining request token"
                    ' from "%s". Response was: %s.'
                )
                % (get_token_prefix(self.request_token_url), response.text)
            )
        self.request_token = dict(parse_qsl(response.text))
        self.request.session[
            "oauth_%s_request_token" % get_token_prefix(self.request_token_url)
        ] = self.request_token
    return self.request_token