public function verifyResponse($response, $clientIp)
    {
        if (empty($response)) {
            return false;
        }

        $response = $this->sendVerifyRequest([
            'secret' => $this->secretKey,
            'remoteip' => $clientIp,
            'response' => $response
        ]);

        return isset($response['success']) && $response['success'] === true;
    }