public function deliveryMethodCheck() {
        return function () {
            global $usces, $usces_settings;

            $mes = '';
            if (!isset($_POST['offer']['delivery_method']) || (empty($_POST['offer']['delivery_method']) && !\WCUtils::is_zero($_POST['offer']['delivery_method']))) {
                $mes .= __('chose one from delivery method.', 'usces') . '<br />';
            } else {
                $d_method_index = $usces->get_delivery_method_index((int)$_POST['offer']['delivery_method']);
                if (0 > $d_method_index) {
                    $mes .= __('chose one from delivery method.', 'usces') . '<br />';
                } else {
                    $country = $_SESSION['usces_entry']['delivery']['country'];

                    $WPLANG = get_option('WPLANG');
                    $wplang = !empty($WPLANG) ? $WPLANG : get_locale();
                    $locale = empty($wplang) ? 'en' : $wplang;
                    $local_country = array_key_exists($locale, $usces_settings['lungage2country']) ? $usces_settings['lungage2country'][$locale] : 'US';

                    if ($country == $local_country) {
                        if ($usces->options['delivery_method'][$d_method_index]['intl'] == 1) {
                            $mes .= __('Delivery method is incorrect. Can not specify an international flight.', 'usces') . '<br />';
                        }
                    } else {
                        if (\WCUtils::is_zero($usces->options['delivery_method'][$d_method_index]['intl'])) {
                            $mes .= __('Delivery method is incorrect. Specify the international flights.', 'usces') . '<br />';
                        }
                    }
                }
            }

            if (!\WCUtils::is_blank($mes)) {
                return $this->module->errors->getErrorResponse(
                    GenericErrorStore::USCES_DELIVERY_METHOD_INVALID,
                    [$mes],
                    [$mes]
                );
            }
        };
    }