protected function _getLib()
    {
        require_once Plugin::classPath('Captcha') . 'Lib/ayah.php';

        return new \AYAH([
            'publisher_key' => $this->config('publisherKey'),
            'scoring_key' => $this->config('scoringKey'),
            'web_service_host' => 'ws.areyouahuman.com',
            'use_curl' => true,
            'debug_mode' => Configure::read('debug'),
        ]);
    }