diff --git a/Classes/Controller/Order/PaymentController.php b/Classes/Controller/Order/PaymentController.php
index d547d52..7793c05 100644
--- a/Classes/Controller/Order/PaymentController.php
+++ b/Classes/Controller/Order/PaymentController.php
@@ -16,7 +16,9 @@
 use Extcode\CartPaypal\Event\Order\CancelEvent;
 use Extcode\CartPaypal\Event\Order\NotifyEvent;
 use Extcode\CartPaypal\Event\Order\SuccessEvent;
+use Psr\Log\LoggerAwareTrait;
 use Psr\Log\LoggerInterface;
+use TYPO3\CMS\Core\Log\LogManager;
 use TYPO3\CMS\Core\Log\LogManagerInterface;
 use TYPO3\CMS\Core\Messaging\AbstractMessage;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -28,6 +30,8 @@
 
 class PaymentController extends ActionController
 {
+    use LoggerAwareTrait;
+
     const PAYPAL_API_SANDBOX = 'https://www.sandbox.paypal.com/cgi-bin/webscr?';
     const PAYPAL_API_LIVE = 'https://www.paypal.com/cgi-bin/webscr?';
 
@@ -66,6 +70,16 @@ class PaymentController extends ActionController
      */
     protected $cartConf = [];
 
+    /**
+     * @var string|bool
+     */
+    protected $curlResult;
+
+    /**
+     * @var array
+     */
+    protected $curlResults;
+
     /**
      * @var array
      */
@@ -78,7 +92,8 @@ public function __construct(
         CartRepository $cartRepository,
         PaymentRepository $paymentRepository
     ) {
-        $this->logger = $logManager->getLogger();
+        // $this->logger = $logManager->getLogger();
+        $this->logger = GeneralUtility::makeInstance(LogManager::class)->getLogger(__CLASS__);
         $this->persistenceManager = $persistenceManager;
         $this->sessionHandler = $sessionHandler;
         $this->cartRepository = $cartRepository;
@@ -183,11 +198,18 @@ public function cancelAction(): void
         }
     }
 
-    public function notifyAction(): void
+    public function notifyAction()
     {
         if ($this->request->getMethod() !== 'POST') {
-            $this->response->setStatus(405);
-            exit();
+            if ($this->cartPaypalConf['debug']) {
+                $this->logger->error(
+                    'Notify Action called without Post vars. ' . ' In class ' . get_class($this) . ':' . __LINE__,
+                    [
+                        'order' => ((!empty($_GET['tx_cartpaypal_cart']['order'])) ? $_GET['tx_cartpaypal_cart']['order'] : 'No order ID given')
+                    ]
+                );
+            }
+            return $this->htmlResponse()->withStatus(405, 'Method not allowed.');
         }
 
         $postData = GeneralUtility::_POST();
@@ -195,7 +217,7 @@ public function notifyAction(): void
         $curlRequest = $this->getCurlRequestFromPostData($postData);
 
         if ($this->cartPaypalConf['debug']) {
-            $this->logger->debug(
+            $this->logger->error(
                 'Log Data',
                 [
                     '$parsedPostData' => $postData,
@@ -208,15 +230,37 @@ public function notifyAction(): void
 
         $cartSHash = $postData['custom'];
         if (empty($cartSHash)) {
-            $this->response->setStatus(403);
-            exit();
+            // debug
+            if ($this->cartPaypalConf['debug']) {
+                $this->logger->error(
+                    'Notify Action called with empty cartSHash. ' . ' In class ' . get_class($this) . ':' . __LINE__,
+                    [
+                        'order' => ((!empty($_GET['tx_cartpaypal_cart']['order'])) ? $_GET['tx_cartpaypal_cart']['order'] : 'No order ID given'),
+                        '$parsedPostData' => $postData,
+                        '$curlRequest' => $curlRequest
+                    ]
+                );
+            }
+            // end debug
+            return $this->htmlResponse()->withStatus(403, 'Not allowed.');
         }
 
         $this->loadCartByHash($this->request->getArgument('hash'));
 
         if ($this->cart === null) {
-            $this->response->setStatus(404);
-            exit();
+            // debug
+            if ($this->cartPaypalConf['debug']) {
+                $this->logger->error(
+                    'Notify Action but couldn`t load cart by hash. ' . ' In class ' . get_class($this) . ':' . __LINE__,
+                    [
+                        'order' => ((!empty($_GET['tx_cartpaypal_cart']['order'])) ? $_GET['tx_cartpaypal_cart']['order'] : 'No order ID given'),
+                        '$parsedPostData' => $postData,
+                        '$curlRequest' => $curlRequest
+                    ]
+                );
+            }
+            // end debug
+            return $this->htmlResponse()->withStatus(404, 'Page / Cart not found.');
         }
 
         $orderItem = $this->cart->getOrderItem();
@@ -229,10 +273,22 @@ public function notifyAction(): void
 
             $notifyEvent = new NotifyEvent($this->cart->getCart(), $orderItem, $this->cartConf);
             $this->eventDispatcher->dispatch($notifyEvent);
+        } else {
+            // debug
+            if ($this->cartPaypalConf['debug']) {
+                $this->logger->error(
+                    'Notify Action success. ' . ' In class ' . get_class($this) . ':' . __LINE__,
+                    [
+                        'order' => ((!empty($_GET['tx_cartpaypal_cart']['order'])) ? $_GET['tx_cartpaypal_cart']['order'] : 'No order ID given'),
+                        '$parsedPostData' => $postData,
+                        '$curlRequest' => $curlRequest
+                    ]
+                );
+            }
+            // end debug
         }
 
-        $this->response->setStatus(200);
-        exit();
+        return $this->htmlResponse()->withStatus(200);
     }
 
     protected function restoreCartSession(): void
@@ -297,7 +353,7 @@ protected function execCurlRequest(string $curlRequest): bool
         }
 
         if ($this->cartPaypalConf['debug']) {
-            $this->logger->debug(
+            $this->logger->error(
                 'paypal-payment-api',
                 [
                     'curl_info' => curl_getinfo($ch, CURLINFO_HEADER_OUT),
diff --git a/Classes/EventListener/Order/Payment/ClearCart.php b/Classes/EventListener/Order/Payment/ClearCart.php
index 25f95a6..dc1ef5f 100644
--- a/Classes/EventListener/Order/Payment/ClearCart.php
+++ b/Classes/EventListener/Order/Payment/ClearCart.php
@@ -10,9 +10,23 @@
  */
 
 use Extcode\Cart\Event\Order\EventInterface;
+use Extcode\Cart\EventListener\Order\Finish\ClearCart as FinishClearCart;
+use Extcode\Cart\Service\SessionHandler;
+use Extcode\Cart\Utility\CartUtility;
+use Extcode\Cart\Utility\ParserUtility;
 
-class ClearCart extends \Extcode\Cart\EventListener\ProcessOrderCreate\ClearCart
+class ClearCart extends FinishClearCart
 {
+    public function __construct(
+        CartUtility $cartUtility,
+        ParserUtility $parserUtility,
+        SessionHandler $sessionHandler
+    ) {
+        $this->cartUtility = $cartUtility;
+        $this->parserUtility = $parserUtility;
+        $this->sessionHandler = $sessionHandler;
+    }
+
     public function __invoke(EventInterface $event): void
     {
         $orderItem = $event->getOrderItem();
diff --git a/Classes/EventListener/Order/Payment/ProviderRedirect.php b/Classes/EventListener/Order/Payment/ProviderRedirect.php
index 78c7966..872fcb9 100644
--- a/Classes/EventListener/Order/Payment/ProviderRedirect.php
+++ b/Classes/EventListener/Order/Payment/ProviderRedirect.php
@@ -12,6 +12,7 @@
 use Extcode\Cart\Domain\Model\Cart;
 use Extcode\Cart\Domain\Model\Cart\Cart as CartCart;
 use Extcode\Cart\Domain\Model\Cart\CartCoupon;
+use Extcode\Cart\Domain\Model\Cart\CartCouponPercentage;
 use Extcode\Cart\Domain\Model\Order\Item as OrderItem;
 use Extcode\Cart\Domain\Repository\CartRepository;
 use Extcode\Cart\Event\Order\PaymentEvent;
@@ -229,7 +230,12 @@ protected function addEachCouponFromCartToQuery(): void
              */
             foreach ($this->cart->getCoupons() as $cartCoupon) {
                 if ($cartCoupon->getIsUseable()) {
-                    $discount += $cartCoupon->getDiscount();
+                    // A.K.: Differentiate between percentage and fixed discount
+                    if ($cartCoupon instanceof CartCouponPercentage) {
+                        $discount += (float)($this->orderItem->getGross() * $cartCoupon->getDiscount());
+                    } else {
+                        $discount += $cartCoupon->getDiscount();
+                    }
                 }
             }
 
diff --git a/Configuration/Services.yaml b/Configuration/Services.yaml
index 95766b8..dc17ee4 100644
--- a/Configuration/Services.yaml
+++ b/Configuration/Services.yaml
@@ -17,6 +17,10 @@ services:
       $paymentRepository: '@Extcode\Cart\Domain\Repository\Order\PaymentRepository'
 
   Extcode\CartPaypal\EventListener\Order\Payment\ClearCart:
+    arguments:
+      $cartUtility: '@Extcode\Cart\Utility\CartUtility'
+      $parserUtility: '@Extcode\Cart\Utility\ParserUtility'
+      $sessionHandler: '@Extcode\Cart\Service\SessionHandler'
     tags:
       - name: event.listener
         identifier: 'cart-paypal--order--payment--clear-cart'
@@ -35,7 +39,7 @@ services:
         event: Extcode\Cart\Event\Order\PaymentEvent
 
   Extcode\CartPaypal\EventListener\Order\Notify\Email:
-    class: 'Extcode\Cart\EventListener\ProcessOrderCreate\Email'
+    class: 'Extcode\Cart\EventListener\Order\Finish\Email'
     tags:
       - name: event.listener
         identifier: 'cart-paypal--order--notify--email'
diff --git a/Configuration/TCA/Overrides/sys_template.php b/Configuration/TCA/Overrides/sys_template.php
index f3e6709..611f5a9 100644
--- a/Configuration/TCA/Overrides/sys_template.php
+++ b/Configuration/TCA/Overrides/sys_template.php
@@ -1,5 +1,5 @@
 <?php
-defined('TYPO3_MODE') or die();
+defined('TYPO3') or die();
 
 call_user_func(function () {
     \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile(
diff --git a/Configuration/TCA/Overrides/tx_cart_domain_model_order_transaction.php b/Configuration/TCA/Overrides/tx_cart_domain_model_order_transaction.php
index 957d3ac..22c7025 100644
--- a/Configuration/TCA/Overrides/tx_cart_domain_model_order_transaction.php
+++ b/Configuration/TCA/Overrides/tx_cart_domain_model_order_transaction.php
@@ -1,6 +1,6 @@
 <?php
 
-defined('TYPO3_MODE') or die();
+defined('TYPO3') or die();
 
 $_LLL = 'LLL:EXT:cart_paypal/Resources/Private/Language/locallang_db.xlf';
 
diff --git a/Resources/Private/Templates/Order/Payment/Notify.html b/Resources/Private/Templates/Order/Payment/Notify.html
new file mode 100644
index 0000000..fcb9b98
--- /dev/null
+++ b/Resources/Private/Templates/Order/Payment/Notify.html
@@ -0,0 +1,11 @@
+<f:layout name="Default"/>
+
+<f:section name="main">
+    <f:flashMessages/>
+
+    <f:if condition="{orderItem}">
+        <div class="col-sm-12 col-md-12 col-lg-12">
+            <f:translate key="tx_cart.controller.order.action.payment_cancel.thank_you"/>
+        </div>
+    </f:if>
+</f:section>
diff --git a/composer.json b/composer.json
index 06c69fb..2b5507a 100644
--- a/composer.json
+++ b/composer.json
@@ -12,6 +12,7 @@
         "PayPal",
         "cart"
     ],
+    "version": "5.1.0",
     "authors": [
         {
             "name": "Daniel Gohlke",
@@ -29,7 +30,11 @@
     },
     "config": {
         "bin-dir": ".build/bin",
-        "vendor-dir": ".build/vendor"
+        "vendor-dir": ".build/vendor",
+        "allow-plugins": {
+            "typo3/cms-composer-installers": true,
+            "typo3/class-alias-loader": true
+        }
     },
     "extra": {
         "typo3/cms": {
@@ -39,15 +44,15 @@
         }
     },
     "require": {
-        "php": ">=7.2.0 <7.5",
+        "php": ">=7.4.0 <8.2",
         "ext-curl": "*",
-        "typo3/cms-core": "^10.4",
-        "typo3/cms-extbase": "^10.4",
-        "typo3/cms-frontend": "^10.4",
-        "extcode/cart": "^7.4"
+        "typo3/cms-core": "^11.5",
+        "typo3/cms-extbase": "^11.5",
+        "typo3/cms-frontend": "^11.5",
+        "extcode/cart": "^8.0"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^2.14",
+        "friendsofphp/php-cs-fixer": "^3.14",
         "helmich/typo3-typoscript-lint": "^2.0",
         "overtrue/phplint": "^1.1"
     },
diff --git a/ext_emconf.php b/ext_emconf.php
index 6599737..d5d768f 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -7,20 +7,11 @@
     'author' => 'Daniel Gohlke',
     'author_email' => 'ext.cart@extco.de',
     'author_company' => 'extco.de UG (haftungsbeschränkt)',
-    'shy' => '',
-    'priority' => '',
-    'module' => '',
     'state' => 'beta',
-    'internal' => '',
-    'uploadfolder' => '0',
-    'createDirs' => '',
-    'modify_tables' => '',
-    'clearCacheOnLoad' => 0,
-    'lockType' => '',
     'version' => '5.0.0',
     'constraints' => [
         'depends' => [
-            'typo3' => '10.4.0-10.4.99',
+            'typo3' => '11.5.0-11.5.99',
             'cart' => '7.4.0',
         ],
         'conflicts' => [],
diff --git a/ext_localconf.php b/ext_localconf.php
index a582ece..4baa585 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -1,6 +1,6 @@
 <?php
 
-defined('TYPO3_MODE') or die();
+defined('TYPO3') or die();
 
 // configure plugins