protected function apiCall()
    {
        $controller = $this->_registry->getController();
        $client = new Client($this->_config['httpClientOptions']);

        return $client->post('https://www.google.com/recaptcha/api/siteverify', [
            'secret' => $this->_config['secret'],
            'response' => $controller->request->getData('g-recaptcha-response'),
            'remoteip' => $controller->request->clientIp()
        ])->getBody();
    }