private function verificationUrl($response, $remoteIp = null)
    {
        $secret = $this->secret;
        return self::VERIFICATION_URL . '?' . http_build_query(compact('secret', 'response', 'remoteIp'));
    }
private function verificationUrl($response, $remoteIp = null)
    {
        $secret = $this->secret;
        return self::VERIFICATION_URL . '?' . http_build_query(compact('secret', 'response', 'remoteIp'));
    }
private function verificationUrl ( $ response , $ remoteIp = null ) { $ secret = $ this -> secret ; return self :: VERIFICATION_URL . '?' . http_build_query ( compact ( 'secret' , 'response' , 'remoteIp' ) ) ; }
Generates the url to verify the CAPTCHA response.

@param  string $response The user response token.
@param  string $remoteIp The user's IP address
@return string
Generates the url to verify the CAPTCHA response .