public function add($name, $html, $folderId = null) {
        $payload = array(
            'name' => $name,
            'html' => $html,
            'folder_id' => $folderId
        );
        $apiCall = 'templates/add';
        $data = $this->requestMonkey($apiCall, $payload);
        $data = json_decode($data,true);
        if (isset($data['error']))
            throw new MailchimpAPIException($data);
        else
            return isset($data['template_id']) ? $data['template_id'] : false;
    }