public function update(array $args, array $payload) {
        $groupId = (int)$args['groupId'];
        $label = !empty($payload['label']) ? (string)$payload['label'] : '';
        $optional = !empty($payload['optional']) ? (bool)$payload['optional'] : false;
        $enableMultiSelect = !empty($payload['enableMultiSelect']) ? (bool)$payload['enableMultiSelect'] : false;
        return API\ComboGroup::updateComboGroup($groupId, $label, $optional, $enableMultiSelect);
    }