Prado\Web\UI\WebControls\TReCaptcha2::getResponseFieldName PHP Method

    public function getResponseFieldName()
    {
        $captchas = $this->Page->findControlsByType('TReCaptcha2');
        $cont = 0;
        $responseFieldName = self::ChallengeFieldName;
        foreach ($captchas as $captcha) {
            if ($this->getClientID() == $captcha->ClientID) {
                $responseFieldName .= $cont > 0 ? '-' . $cont : '';
            }
            $cont++;
        }
        return $responseFieldName;
    }