Почему варианты доставки клиента не соответствуют настройкам базы данных или модуля в Zen Cart 1.5?

У клиента есть собственный модуль доставки в Zen Cart 1.5. Вчера я адаптировал модуль, чтобы он учитывал зоны (они хотели, чтобы оригинальный модуль применялся к США, а копия была изменена для заказов за пределами США).

Теперь у меня есть только один вариант доставки в этом модуле, а не настроенные четыре. Похоже, что осведомленность о зоне работает (в моих тестовых заказах указан сбор США, а не международный сбор за вариант, который отображается), но отображается только первый вариант.

Вот код модуля:

/*include functions/functions_categories.pnp for zen_product_in_category method
*/
class tfn
{
    var $code, $title, $description, $icon, $enabled, $types;

    // class constructor
    function tfn() {
        global $order, $db, $types, $fees;

        $this->code = 'tfn';
        $this->title = MODULE_SHIPPING_TFN_TEXT_TITLE;
        $this->description = MODULE_SHIPPING_TFN_TEXT_DESCRIPTION;
        $this->sort_order = MODULE_SHIPPING_TFN_SORT_ORDER;
        $this->icon = '';
        $this->tax_class = MODULE_SHIPPING_TFN_TAX_CLASS;
        $this->tax_basis = MODULE_SHIPPING_TFN_TAX_BASIS;

        // disable only when entire cart is free shipping
        if (zen_get_shipping_enabled($this->code)) {
            $this->enabled = ((MODULE_SHIPPING_TFN_STATUS == 'True') ? true : false);
        }

        if (($this->enabled == true) && ((int)MODULE_SHIPPING_TFN_ZONE > 0)) {
            $check_flag = false;
            $check = $db->Execute("select zone_id from " . TABLE_ZONES_TO_GEO_ZONES . " where geo_zone_id = '" . MODULE_SHIPPING_TFN_ZONE . "' and zone_country_id = '" . $order->delivery['country']['id'] . "' order by zone_id");
            while (!$check->EOF) {
                if ($check->fields['zone_id'] < 1) {
                    $check_flag = true;
                    break;
                } elseif ($check->fields['zone_id'] == $order->delivery['zone_id']) {
                    $check_flag = true;
                    break;
                }
                $check->MoveNext();
            }

            if ($check_flag == false) {
                $this->enabled = false;
            }
        }

        $types = array(
            'STD'  => 'Standard',
            'FXH'  => 'USPS Priority Mail',
            'FXES' => 'USPS Express Mail',
            'FXSO' => 'FedEx Overnight'
        );
        // 'FAM' => 'Foreign Airmail',
        // 'FXG' => 'USPS Priority Mail with Delivery Confirmation',
        // 'FX2D' => 'FedEx 2nd Day',

        $fees = array(
            'STD'  => '0.00',
            'FXH'  => '4.50',
            'FXES' => '17.50',
            'FXSO' => '28.00'
        );
        // 'FAM' => '15.00',
        // 'FXG' => '5.50',
        // 'FX2D' => '10.00',
    }

    // class methods
    function quote($method = '') {
        global $order, $types, $fees;

        $methods = array();

        $this->quotes = array(
            'id'     => $this->code,
            'module' => $this->title
        );

        if (($method == '') || (!isset($method))) {
            foreach ($fees as $type => $cost) {
                $methods[] = array(
                    'id'    => $type,
                    'title' => $types[$type],
                    'cost'  => $this->_calculateBaseCost() + $cost
                );
            }
        } else {
            $cost = $fees[$method];
            $methods[] = array(
                'id'    => $method,
                'title' => $types[$method],
                'cost'  => $this->_calculateBaseCost() + $cost
            );
        }

        $this->quotes['methods'] = $methods;
        if ($this->tax_class > 0) {
            $this->quotes['tax'] = zen_get_tax_rate($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
        }

        if (zen_not_null($this->icon)) $this->quotes['icon'] = zen_image($this->icon, $this->title);

        return $this->quotes;
    }

    function _calculateBaseCost() {
        global $db, $shipping_cost;

        $total_count = $_SESSION['cart']->count_contents();
        $total_count = $total_count - $_SESSION['cart']->free_shipping_items();
        $foreign_charge = $this->_additionalForeignCharge();
        $shipping_cost = ($total_count * (MODULE_SHIPPING_TFN_BASE_COST + $foreign_charge));

        return $shipping_cost;
    }

    function _additionalForeignCharge() {
        global $db, $order;

        $foreign_charge = 0;

        $dest_country = $order->delivery['country']['iso_code_2'];

        if ($dest_country != 'US') {
            $foreign_charge = MODULE_SHIPPING_TFN_FOREIGN_COST;
        }

        return $foreign_charge;
    }

    function check() {
        global $db;
        if (!isset($this->_check)) {
            $check_query = $db->Execute("select configuration_value from " . TABLE_CONFIGURATION . " where configuration_key = 'MODULE_SHIPPING_TFN_STATUS'");
            $this->_check = $check_query->RecordCount();
        }

        return $this->_check;
    }

    function install() {
        global $db;
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Enable Item Shipping', 'MODULE_SHIPPING_TFN_STATUS', 'True', 'Do you want to offer per item rate shipping?', '6', '0', 'zen_cfg_select_option(array(\'True\', \'False\'), ', now())");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Shipping Cost', 'MODULE_SHIPPING_TFN_BASE_COST', '2.50', 'The shipping cost will be multiplied by the number of items in an order that uses this shipping method.', '6', '0', now())");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Additional Foreign Shipping Cost', 'MODULE_SHIPPING_TFN_FOREIGN_COST', '4.00', 'The additional foreign shipping cost will be multiplied by the number of items and added to the base cost.', '6', '0', now())");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) values ('Tax Class', 'MODULE_SHIPPING_TFN_TAX_CLASS', '0', 'Use the following tax class on the shipping fee.', '6', '0', 'zen_get_tax_class_title', 'zen_cfg_pull_down_tax_classes(', now())");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Tax Basis', 'MODULE_SHIPPING_TFN_TAX_BASIS', 'Shipping', 'On what basis is Shipping Tax calculated. Options are<br />Shipping - Based on customers Shipping Address<br />Billing Based on customers Billing address<br />Store - Based on Store address if Billing/Shipping Zone equals Store zone', '6', '0', 'zen_cfg_select_option(array(\'Shipping\', \'Billing\', \'Store\'), ', now())");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Sort Order', 'MODULE_SHIPPING_TFN_SORT_ORDER', '0', 'Sort order of display.', '6', '0', now())");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Sort Order', 'MODULE_SHIPPING_TFN_SHIPPING_TYPES', '0', 'Code and Name for each kind of shipping offered.', '6', '0', now())");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ( 'Shipping Methods: <br />Standard, Foreign Airmail, FedEx Home Delivery, FedEx Ground, FedEx Express Saver, FedEx 2nd Day, FedEx Standard Overnight', 'MODULE_SHIPPING_TFN_TYPES', 'STD, FAM, FXHD, FXG, FXES, FX2D, FXSO', 'Select the TFN services to be offered.', '6', '13', 'zen_cfg_select_multioption(array(\'STD\',\'FAM\',\'FXHD\', \'FXG\', \'FXES\', \'FX2D\', \'FXSO\'), ', now() )");
        $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) values ('Shipping Zone', 'MODULE_SHIPPING_TFN_ZONE', '0', 'If a zone is selected, only enable this shipping method for that zone.', '6', '0', 'zen_get_zone_class_title', 'zen_cfg_pull_down_zone_classes(', now())");
    }

    function remove() {
        global $db;
        $db->Execute("delete from " . TABLE_CONFIGURATION . " where configuration_key in ('" . implode("', '", $this->keys()) . "')");
    }

    function keys() {
        return array(
            'MODULE_SHIPPING_TFN_STATUS', 'MODULE_SHIPPING_TFN_BASE_COST',
            'MODULE_SHIPPING_TFN_FOREIGN_COST', 'MODULE_SHIPPING_TFN_TAX_CLASS',
            'MODULE_SHIPPING_TFN_TAX_BASIS', 'MODULE_SHIPPING_TFN_SORT_ORDER',
            'MODULE_SHIPPING_TFN_TYPES', 'MODULE_SHIPPING_TFN_ZONE'
        );
    }
}
?>

На странице администратора показаны восемь вариантов доставки, четыре из которых перечислены в выбранном коде.

Вот соответствующие записи базы данных, включая международный модуль:

mysql> select configuration_value, configuration_key from configuration where configuration_key LIKE 'MODULE_SHIPPING_%_TYPES';
+-----------------------+----------------------------------------+
| configuration_value   | configuration_key                      |
+-----------------------+----------------------------------------+
| 0                     | MODULE_SHIPPING_TFN_INT_SHIPPING_TYPES | 
| STD                   | MODULE_SHIPPING_TFN_INT_TYPES          | 
| 0                     | MODULE_SHIPPING_TFN_SHIPPING_TYPES     | 
| STD, FXHD, FXES, FXSO | MODULE_SHIPPING_TFN_TYPES              | 
+-----------------------+----------------------------------------+
4 rows in set (0.00 sec)

Обновление настроек _SHIPPING_TYPES непосредственно в базе данных (например, установка значения 1 вместо 0) ничего не меняет. Я не могу найти код, который, кажется, вызывает этот параметр.

Где Zen Cart определяет варианты доставки? Как я могу заставить его показывать те, которые я хочу?