public function getRequestToken($settings,
                                    OAuthConsumerInterface $consumer,
                                    OAuthTokenInterface $token)
    {
        $url = $settings['auth_api_url'].$settings['request_token_uri'];
        $options = ['oauth_callback' => $settings['callback_url']];

        $headers = $this->headers($settings, 'POST', $url, $consumer, $token, $options);
        // build request
        $request = ['url' => $url,'headers' => $headers];

        return $this->token->makeRequestToken($this->http->post($request));
    }