diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3366785..fc89396 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
-## v.2.4.0
-* Добавлена возможность работы на 3 версиях API (v3, v4, v5)
-* Добавлена совместимость с Opencart 3.0
+## v.2.4.3
+* Устранены некоторые баги, добавлен вывод ошибок при выгрузке единичных заказов
+
+## v.2.4.2
+* Улучшена синхронизация кастомных полей
+* Добавлены настройки дефолтных способов доставки и оплаты
+* Улучшена настройка Daemon Collector
+* Доработан шаблон twig для совместимости с Opencart 3.0
 
 ## v.2.4.1
 * Исправлена работа истории (доработана обработка адресов, добавлена обработка заказов с пустыми полями, доработана история по клиентам)
@@ -8,8 +13,7 @@
 * Проверка доступных версий API через метод /api/versions
 * Добавлена возможность сопоставления кастомных полей(для API v5)
 
-## v.2.4.2
-* Доработана синхронизация кастомных полей
-* Добавлены настройки дефолтных способов доставки и оплаты
-* Доработана настройка Daemon Collector
-* Доработан шаблон twig для совместимости с Opencart 3.0
\ No newline at end of file
+## v.2.4.0
+* Добавлена возможность работы на 3 версиях API (v3, v4, v5)
+* Добавлена совместимость с Opencart 3.0
+
diff --git a/README.ru.md b/README.ru.md
index b3b4f46..1bda844 100644
--- a/README.ru.md
+++ b/README.ru.md
@@ -58,3 +58,7 @@ http://youropencartsite.com/retailcrm.xml
 
 Запустите команду единожды:
 /usr/bin/php /path/to/opencart/system/cron/export.php
+
+#### Кастомизация моделей
+
+Для создания кастомных классов скопируйте файл модели в директорию custom, в новом файле измените название класса с "ModelExtensionRetailcrmFilename" на "ModelExtensionRetailcrmCustomFilename", где "Filename" - название файла с заглавной буквы. После этого модуль будет использовать методы кастомного класса.
\ No newline at end of file
diff --git a/admin/controller/extension/module/retailcrm.php b/admin/controller/extension/module/retailcrm.php
index 4b77e6d..e1b87c7 100644
--- a/admin/controller/extension/module/retailcrm.php
+++ b/admin/controller/extension/module/retailcrm.php
@@ -93,7 +93,12 @@ class ControllerExtensionModuleRetailcrm extends Controller
             ->editSetting($moduleTitle, array($moduleTitle . '_status' => 0));
         $this->model_setting_setting->deleteSetting('retailcrm_history');
         $this->loadModels();
-        $this->{'model_' . $this->modelEvent}->deleteEvent($moduleTitle);
+
+        if (version_compare(VERSION, '3.0', '<')) {
+            $this->{'model_' . $this->modelEvent}->deleteEvent($moduleTitle);
+        } else {
+            $this->{'model_' . $this->modelEvent}->deleteEventByCode($moduleTitle);
+        }
     }
 
     /**
@@ -545,10 +550,29 @@ class ControllerExtensionModuleRetailcrm extends Controller
             $data['order_status'] = $status[$moduleTitle . '_status'][$data['order_status_id']];
 
             $this->load->model('extension/retailcrm/order');
-            $result = $this->model_extension_retailcrm_order->uploadOrder($data);
+            $response = $this->model_extension_retailcrm_order->uploadOrder($data);
         }
 
-        echo json_encode($result->getStatusCode());
+        if (!$response->isSuccessful()) {
+            if (isset($response['errors'])) {
+                $error = implode("\n", $response['errors']);
+            } else {
+                $error = $response->getErrorMsg();
+            }
+
+            echo json_encode(
+                array(
+                    'status_code' => $response->getStatusCode(),
+                    'error_msg' => $error
+                )
+            );
+        } else {
+            echo json_encode(
+                array(
+                    'status_code' => $response->getStatusCode()
+                )
+            );
+        }
     }
 
     /**
diff --git a/admin/model/extension/retailcrm/order.php b/admin/model/extension/retailcrm/order.php
index 75e90c4..87d3316 100644
--- a/admin/model/extension/retailcrm/order.php
+++ b/admin/model/extension/retailcrm/order.php
@@ -72,7 +72,9 @@ class ModelExtensionRetailcrmOrder extends Model {
             $order['email'] = $order_data['email'];
         }
 
-        $order['customer']['externalId'] = $order_data['customer_id'];
+        if ($order_data['customer_id']) {
+            $order['customer']['externalId'] = $order_data['customer_id'];
+        }
 
         $deliveryCost = 0;
         $orderTotals = isset($order_data['totals']) ? $order_data['totals'] : $order_data['order_total'] ;
@@ -192,12 +194,6 @@ class ModelExtensionRetailcrmOrder extends Model {
     protected function createPayment($order, $order_id)
     {   
         $this->moduleTitle = $this->getModuleTitle();
-        
-        if (version_compare(VERSION, '3.0', '<')) {
-            $settingPaid = $this->model_setting_setting->getSetting($order['payment_code']);
-        } else {
-            $settingPaid = $this->model_setting_setting->getSetting('payment_' . $order['payment_code']);
-        }
 
         $payment_code = $order['payment_code'];
 
@@ -211,16 +207,6 @@ class ModelExtensionRetailcrmOrder extends Model {
             'amount' => $amount
         );
 
-        if (version_compare(VERSION, '3.0', '<')) {
-            if ($order['order_status_id'] == $settingPaid[$order['payment_code'] . '_order_status_id']) {
-                $payment['status'] = 'paid';
-            }
-        } else {
-            if ($order['order_status_id'] == $settingPaid['payment_' . $order['payment_code'] . '_order_status_id']) {
-                $payment['status'] = 'paid';
-            }
-        }
-
         $payment['order'] = array(
             'externalId' => $order_id
         );
diff --git a/admin/view/template/extension/module/retailcrm.tpl b/admin/view/template/extension/module/retailcrm.tpl
index 2726cfb..d5ed8b2 100644
--- a/admin/view/template/extension/module/retailcrm.tpl
+++ b/admin/view/template/extension/module/retailcrm.tpl
@@ -376,9 +376,10 @@
                     alert(thrownError + "\r\n" + xhr.statusText + "\r\n" + xhr.responseText);
                 },
                 success: function(data, textStatus, jqXHR) {
-                    if (jqXHR['responseText'] == '400') {
+                    response = JSON.parse(jqXHR['responseText']);
+                    if (response['status_code'] == '400') {
                         $('.alert-danger').remove();
-                        $('#content > .container-fluid').prepend('<div class="alert alert-danger"><i class="fa fa-exclamation-circle"></i><?php echo $text_error_order; ?></div>');
+                        $('#content > .container-fluid').prepend('<div class="alert alert-danger"><i class="fa fa-exclamation-circle"></i><?php echo $text_error_order; ?>' + response['error_msg'] + '</div>');
                         $('#export_order').button('reset');
                     } else {
                         $('.alert-success').remove();
diff --git a/admin/view/template/extension/module/retailcrm.twig b/admin/view/template/extension/module/retailcrm.twig
index 45be023..2be398f 100644
--- a/admin/view/template/extension/module/retailcrm.twig
+++ b/admin/view/template/extension/module/retailcrm.twig
@@ -378,9 +378,11 @@
                     alert(thrownError + "\r\n" + xhr.statusText + "\r\n" + xhr.responseText);
                 },
                 success: function(data, textStatus, jqXHR) {
-                    if (jqXHR['responseText'] == '400') {
+                    response = JSON.parse(jqXHR['responseText']);
+
+                    if (response['status_code'] == '400') {
                         $('.alert-danger').remove();
-                        $('#content > .container-fluid').prepend('<div class="alert alert-danger"><i class="fa fa-exclamation-circle"></i>{{ text_error_order }}</div>');
+                        $('#content > .container-fluid').prepend('<div class="alert alert-danger"><i class="fa fa-exclamation-circle"></i>{{ text_error_order }}' + response['error_msg'] + '</div>');
                         $('#export_order').button('reset');
                     } else {
                         $('.alert-success').remove();
diff --git a/catalog/model/extension/retailcrm/order.php b/catalog/model/extension/retailcrm/order.php
index fba3af0..d08c003 100644
--- a/catalog/model/extension/retailcrm/order.php
+++ b/catalog/model/extension/retailcrm/order.php
@@ -79,6 +79,8 @@ class ModelExtensionRetailcrmOrder extends Model {
                 if ($response->isSuccessful()) {
                     $this->createPayment($order_data, $order_id);
                 }
+            } elseif (isset($payment) && $payment['type'] == $this->settings[$this->moduleTitle . '_payment'][$order_data['payment_code']]) {
+                $this->editPayment($order_data, $order_id);
             }
         }
     }
@@ -89,12 +91,6 @@ class ModelExtensionRetailcrmOrder extends Model {
         $this->load->model('setting/setting');
         $this->load->model('catalog/product');
         $this->settings = $this->model_setting_setting->getSetting($this->moduleTitle);
-      
-        if (version_compare(VERSION, '3.0', '<')) {
-            $settingPaid = $this->model_setting_setting->getSetting($order_data['payment_code']);
-        } else {
-            $settingPaid = $this->model_setting_setting->getSetting('payment_' . $order_data['payment_code']);
-        }
 
         $payment_code = $order_data['payment_code'];
         $order['externalId'] = $order_id;
@@ -225,18 +221,6 @@ class ModelExtensionRetailcrmOrder extends Model {
                 $order['status'] = $this->settings[$this->moduleTitle . '_status'][$order_data['order_status_id']];
             }
 
-            if ($this->settings[$this->moduleTitle . '_apiversion'] != 'v5') {
-                if (version_compare(VERSION, '3.0', '<')) {
-                    if ($order_data['order_status_id'] == $settingPaid[$order_data['payment_code'] . '_order_status_id']) {
-                        $order['paymentStatus'] = 'paid';
-                    }
-                } else {
-                    if ($order_data['order_status_id'] == $settingPaid['payment_' . $order_data['payment_code'] . '_order_status_id']) {
-                        $order['paymentStatus'] = 'paid';
-                    }
-                }
-            }
-
             if (isset($this->settings[$this->moduleTitle . '_custom_field']) && $order_data['custom_field']) {
                 $customFields = $order_data['custom_field'];
 
@@ -256,13 +240,7 @@ class ModelExtensionRetailcrmOrder extends Model {
     }
 
     protected function createPayment($order, $order_id)
-    {       
-        if (version_compare(VERSION, '3.0', '<')) {
-            $settingPaid = $this->model_setting_setting->getSetting($order['payment_code']);
-        } else {
-            $settingPaid = $this->model_setting_setting->getSetting('payment_' . $order['payment_code']);
-        }
-
+    {
         $payment_code = $order['payment_code'];
 
         foreach ($order['totals'] as $total) {
@@ -283,17 +261,13 @@ class ModelExtensionRetailcrmOrder extends Model {
     }
 
     protected function editPayment($order, $order_id)
-    {   
-        if (version_compare(VERSION, '3.0', '<')) {
-            $settingPaid = $this->model_setting_setting->getSetting($order['payment_code']);
-        } else {
-            $settingPaid = $this->model_setting_setting->getSetting('payment_' . $order['payment_code']);
-        }
-
+    {
         $payment_code = $order['payment_code'];
 
         foreach ($order['totals'] as $total) {
-            if ($total['code'] == 'total') $amount = $total['value'];
+            if ($total['code'] == 'total') {
+                $amount = $total['value'];
+            }
         }
 
         $payment = array(