protected function processAuth()
    {
        if ($this->doQueryString) {
            $this->parameters['consumer_key']    = $this->consumerKey;
            $this->parameters['consumer_secret'] = $this->consumerSecret;
        } else {
            \curl_setopt($this->ch, CURLOPT_USERPWD, $this->consumerKey . ':' . $this->consumerSecret);
        }
    }