public static function send(
        Bookboon $bookboon,
        array $variables = [],
        string $rootSegmentId = ''
    ) : BookboonResponse {
        $url = $rootSegmentId == '' ? '/questions' : '/questions/' . $rootSegmentId;
        $bResponse = $bookboon->rawRequest($url, $variables, ClientInterface::HTTP_POST);
        return $bResponse;
    }