diff --git a/Classes/Controller/Order/PaymentController.php b/Classes/Controller/Order/PaymentController.php
index 5b4be47..7793c05 100644
--- a/Classes/Controller/Order/PaymentController.php
+++ b/Classes/Controller/Order/PaymentController.php
@@ -70,6 +70,16 @@ class PaymentController extends ActionController
      */
     protected $cartConf = [];
 
+    /**
+     * @var string|bool
+     */
+    protected $curlResult;
+
+    /**
+     * @var array
+     */
+    protected $curlResults;
+
     /**
      * @var array
      */
diff --git a/Classes/EventListener/Order/Payment/ProviderRedirect.php b/Classes/EventListener/Order/Payment/ProviderRedirect.php
index 78c7966..872fcb9 100644
--- a/Classes/EventListener/Order/Payment/ProviderRedirect.php
+++ b/Classes/EventListener/Order/Payment/ProviderRedirect.php
@@ -12,6 +12,7 @@
 use Extcode\Cart\Domain\Model\Cart;
 use Extcode\Cart\Domain\Model\Cart\Cart as CartCart;
 use Extcode\Cart\Domain\Model\Cart\CartCoupon;
+use Extcode\Cart\Domain\Model\Cart\CartCouponPercentage;
 use Extcode\Cart\Domain\Model\Order\Item as OrderItem;
 use Extcode\Cart\Domain\Repository\CartRepository;
 use Extcode\Cart\Event\Order\PaymentEvent;
@@ -229,7 +230,12 @@ protected function addEachCouponFromCartToQuery(): void
              */
             foreach ($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/composer.json b/composer.json
index 36f6c63..2b5507a 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +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": {
@@ -40,7 +44,7 @@
         }
     },
     "require": {
-        "php": ">=7.2.0 <8.2",
+        "php": ">=7.4.0 <8.2",
         "ext-curl": "*",
         "typo3/cms-core": "^11.5",
         "typo3/cms-extbase": "^11.5",
@@ -48,7 +52,7 @@
         "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 827542c..d5d768f 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -11,7 +11,7 @@
     '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' => [],