diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ee21fc..16597f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+2.8.4, 2024-02-13:
+- Improve IPN errors management.
+
 2.8.3, 2024-01-03:
 - Set return mode to POST by default.
 - [technical] Improve features management by plugin variant.
diff --git a/Controller/Adminhtml/Payment/Check.php b/Controller/Adminhtml/Payment/Check.php
index b180a8d..e039605 100644
--- a/Controller/Adminhtml/Payment/Check.php
+++ b/Controller/Adminhtml/Payment/Check.php
@@ -51,6 +51,11 @@ public function execute()
             $response = $data['response'];
 
             $case = $this->checkProcessor->execute($order, $response);
+            if ($case === 'payment_ko_on_order_ok') {
+                header(\Lyranetwork\Payzen\Helper\Payment::HEADER_ERROR_500);
+                die($response->getOutputForGateway($case));
+            }
+
             return $this->renderResponse($response->getOutputForGateway($case));
         } catch (\Lyranetwork\Payzen\Model\ResponseException $e) {
             return $this->renderResponse($e->getMessage());
diff --git a/Controller/Payment/Check.php b/Controller/Payment/Check.php
index a23b051..c6134f7 100644
--- a/Controller/Payment/Check.php
+++ b/Controller/Payment/Check.php
@@ -51,6 +51,11 @@ public function execute()
             $response = $data['response'];
 
             $case = $this->checkProcessor->execute($order, $response);
+            if ($case === 'payment_ko_on_order_ok') {
+                header(\Lyranetwork\Payzen\Helper\Payment::HEADER_ERROR_500);
+                die($response->getOutputForGateway($case));
+            }
+
             return $this->renderResponse($response->getOutputForGateway($case));
         } catch (\Lyranetwork\Payzen\Model\ResponseException $e) {
             return $this->renderResponse($e->getMessage());
diff --git a/Controller/Payment/Rest/Check.php b/Controller/Payment/Rest/Check.php
index 2931f0a..626c0d0 100644
--- a/Controller/Payment/Rest/Check.php
+++ b/Controller/Payment/Rest/Check.php
@@ -9,6 +9,7 @@
  */
 namespace Lyranetwork\Payzen\Controller\Payment\Rest;
 
+use \Lyranetwork\Payzen\Helper\Payment as PayzenPaymentHelper;
 use Lyranetwork\Payzen\Model\ResponseException;
 use Magento\Framework\DataObject;
 
@@ -89,13 +90,15 @@ protected function prepareResponse($params)
         // Check the validity of the request.
         if (! $this->restHelper->checkResponseFormat($params)) {
             $this->dataHelper->log('Invalid response received. Content: ' . json_encode($params), \Psr\Log\LogLevel::ERROR);
-            throw new ResponseException('<span style="display:none">KO-Invalid IPN request received.'."\n".'</span>');
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die('<span style="display:none">KO-Invalid IPN request received.'."\n".'</span>');
         }
 
         $answer = json_decode($params['kr-answer'], true);
         if (! is_array($answer)) {
             $this->dataHelper->log('Invalid response received. Content: ' . json_encode($params), \Psr\Log\LogLevel::ERROR);
-            throw new ResponseException('<span style="display:none">KO-Invalid IPN request received.' . "\n" . '</span>');
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die('<span style="display:none">KO-Invalid IPN request received.' . "\n" . '</span>');
         }
 
         // Wrap payment result to use traditional order creation tunnel.
@@ -115,7 +118,8 @@ protected function prepareResponse($params)
         $orderId = (int) $response->get('order_id');
         if (! $orderId) {
             $this->dataHelper->log("Received empty Order ID.", \Psr\Log\LogLevel::ERROR);
-            throw new ResponseException('Order ID is empty.');
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die('Order ID is empty.');
         }
 
         $order = $this->orderFactory->create();
@@ -126,7 +130,8 @@ protected function prepareResponse($params)
             if ($quoteId = (int) $response->getExtInfo('quote_id')) {
                 if ($this->quoteRepository->get($quoteId)->getId()) {
                     $this->dataHelper->log("Quote not found with ID #{$quoteId}.", \Psr\Log\LogLevel::ERROR);
-                    throw new ResponseException($response->getOutputForGateway('order_not_found'));
+                    header(PayzenPaymentHelper::HEADER_ERROR_500);
+                    die($response->getOutputForGateway('order_not_found'));
                 }
 
                 $quote = $this->quoteRepository->get($quoteId);
@@ -149,11 +154,13 @@ protected function prepareResponse($params)
                 $order->loadByIncrementId($quote->getReservedOrderId());
                 if (! $order->getId()) {
                     $this->dataHelper->log("Order cannot be created. Quote ID: #{$quoteId}, reserved order ID: #{$quote->getReservedOrderId()}.", \Psr\Log\LogLevel::ERROR);
-                    throw new ResponseException($response->getOutputForGateway('ko', 'Error when trying to create order.'));
+                    header(PayzenPaymentHelper::HEADER_ERROR_500);
+                    die($response->getOutputForGateway('ko', 'Error when trying to create order.'));
                 }
             } else {
                 $this->dataHelper->log("Order not found with ID #{$orderId}.", \Psr\Log\LogLevel::ERROR);
-                throw new ResponseException("Order not found with ID #{$orderId}.");
+                header(PayzenPaymentHelper::HEADER_ERROR_500);
+                die("Order not found with ID #{$orderId}.");
             }
         }
 
@@ -186,7 +193,8 @@ protected function prepareResponse($params)
                 \Psr\Log\LogLevel::ERROR
             );
 
-            throw new ResponseException($response->getOutputForGateway('auth_fail'));
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die($response->getOutputForGateway('auth_fail'));
         }
 
         return [
@@ -206,7 +214,8 @@ protected function saveOrderForQuote($quote)
             $this->onepage->saveOrder();
         } catch (Exception $e) {
             $this->dataHelper->log("Order cannot be created. Quote ID: #{$quote->getId()}, reserved order ID: #{$quote->getReservedOrderId()}.", \Psr\Log\LogLevel::ERROR);
-            throw new ResponseException('Error when trying to create order.');
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die('Error when trying to create order.');
         }
     }
 }
diff --git a/Controller/Processor/CheckProcessor.php b/Controller/Processor/CheckProcessor.php
index b380c9f..aefef7f 100644
--- a/Controller/Processor/CheckProcessor.php
+++ b/Controller/Processor/CheckProcessor.php
@@ -9,8 +9,8 @@
  */
 namespace Lyranetwork\Payzen\Controller\Processor;
 
+use \Lyranetwork\Payzen\Helper\Payment as PayzenPaymentHelper;
 use \Lyranetwork\Payzen\Model\Api\Form\Api as PayzenApi;
-use Lyranetwork\Payzen\Model\ResponseException;
 
 class CheckProcessor
 {
@@ -60,7 +60,7 @@ class CheckProcessor
      * @param \Magento\Store\Model\StoreManagerInterface $storeManager
      * @param \Magento\Store\Model\App\Emulation $emulation
      * @param \Lyranetwork\Payzen\Helper\Data $dataHelper
-     * @param \Lyranetwork\Payzen\Helper\Payment $paymentHelper
+     * @param PayzenPaymentHelper $paymentHelper
      * @param \Magento\Sales\Model\OrderFactory $orderFactory
      * @param \Lyranetwork\Payzen\Model\Api\Form\ResponseFactory $payzenResponseFactory
      * @param \Magento\Sales\Model\Order\CreditmemoFactory $creditmemoFactory
@@ -70,7 +70,7 @@ public function __construct(
         \Magento\Store\Model\StoreManagerInterface $storeManager,
         \Magento\Store\Model\App\Emulation $emulation,
         \Lyranetwork\Payzen\Helper\Data $dataHelper,
-        \Lyranetwork\Payzen\Helper\Payment $paymentHelper,
+        PayzenPaymentHelper $paymentHelper,
         \Magento\Sales\Model\OrderFactory $orderFactory,
         \Lyranetwork\Payzen\Model\Api\Form\ResponseFactory $payzenResponseFactory,
         \Magento\Sales\Model\Order\CreditmemoFactory $creditmemoFactory,
@@ -275,7 +275,8 @@ public function prepareResponse($params)
                 \Psr\Log\LogLevel::ERROR
             );
 
-            throw new ResponseException($response->getOutputforGateway('auth_fail'));
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die($response->getOutputforGateway('auth_fail'));
         }
 
         return [
@@ -290,7 +291,8 @@ private function findOrder($params)
         $orderId = key_exists('vads_order_id', $params) ? $params['vads_order_id'] : null;
         if (! $orderId) {
             $this->dataHelper->log('Order ID is empty. Content: ' . json_encode($params), \Psr\Log\LogLevel::ERROR);
-            throw new ResponseException('<span style="display:none">KO-Invalid IPN request received.'."\n".'</span>');
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die('<span style="display:none">KO-Invalid IPN request received.'."\n".'</span>');
         }
 
         // Loading order.
@@ -299,7 +301,8 @@ private function findOrder($params)
 
         if (! $order->getId()) {
             $this->dataHelper->log("Order not found with ID #{$orderId}.", \Psr\Log\LogLevel::ERROR);
-            throw new ResponseException('<span style="display:none">KO-Order not found.' . "\n" . '</span>');
+            header(PayzenPaymentHelper::HEADER_ERROR_500);
+            die('<span style="display:none">KO-Order not found.' . "\n" . '</span>');
         }
 
         return $order;
diff --git a/Helper/Payment.php b/Helper/Payment.php
index 572847a..34ec0a5 100644
--- a/Helper/Payment.php
+++ b/Helper/Payment.php
@@ -54,6 +54,8 @@ class Payment
 
     const BRAND_USER_CHOICE = 'payzen_brand_user_choice';
 
+    const HEADER_ERROR_500 = 'HTTP/1.1 500 Internal Server Error';
+
     const SUCCESS = 1;
     const FAILURE = 2;
     const CANCEL = 3;
diff --git a/Model/Api/Form/Api.php b/Model/Api/Form/Api.php
index df9274a..993b7bf 100644
--- a/Model/Api/Form/Api.php
+++ b/Model/Api/Form/Api.php
@@ -258,7 +258,6 @@ public static function getSuccessStatuses()
     {
         return array(
             'AUTHORISED',
-            'AUTHORISED_TO_VALIDATE', // TODO is this a pending status?
             'CAPTURED',
             'ACCEPTED',
             'PARTIALLY_AUTHORISED'
@@ -279,6 +278,8 @@ public static function getPendingStatuses()
             'UNDER_VERIFICATION',
             'PRE_AUTHORISED',
             'WAITING_FOR_PAYMENT',
+            'AUTHORISED_TO_VALIDATE',
+            'SUSPENDED',
             'PENDING'
         );
     }
@@ -289,7 +290,11 @@ public static function getPendingStatuses()
      */
     public static function getCancelledStatuses()
     {
-        return array('ABANDONED');
+        return array(
+            'ABANDONED',
+            'NOT_CREATED',
+            'CANCELLED'
+        );
     }
 
     /**
@@ -298,7 +303,10 @@ public static function getCancelledStatuses()
      */
     public static function getToValidateStatuses()
     {
-        return array('WAITING_AUTHORISATION_TO_VALIDATE', 'AUTHORISED_TO_VALIDATE');
+        return array(
+            'WAITING_AUTHORISATION_TO_VALIDATE', 
+            'AUTHORISED_TO_VALIDATE'
+        );
     }
 
     /**
diff --git a/composer.json b/composer.json
index ebd3bcb..bc4c2cd 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
 		"php" : "~7|~8"
 	},
 	"type" : "magento2-module",
-	"version" : "2.8.3",
+	"version" : "2.8.4",
 	"license" : "OSL-3.0",
 	"autoload" : {
 		"files" : [
diff --git a/etc/config.xml b/etc/config.xml
index 6f22e43..39b66bc 100644
--- a/etc/config.xml
+++ b/etc/config.xml
@@ -25,7 +25,7 @@
         <payzen>
             <general>
                 <support_email><![CDATA[support@payzen.eu]]></support_email>
-                <plugin_version>2.8.3</plugin_version>
+                <plugin_version>2.8.4</plugin_version>
                 <gateway_version>V2</gateway_version>
                 <cms_identifier>Magento_2.x</cms_identifier>
                 <enable_logs>1</enable_logs>