public function customOrderFieldsCheck() {
        return function () {
            if ($this->module->getActingOpts()['quickpay_custom_order_fields'] === 'on') {
                $mes = '';
                $mes = usces_filter_delivery_check_custom_order($mes);
                if (!\WCUtils::is_blank($mes)) {
                    return $this->module->errors->getErrorResponse(
                        GenericErrorStore::USCES_CUSTOM_FIELDS_ERR,
                        [$mes],
                        [$mes]
                    );
                }
            }
        };
    }