diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e2129c7a..70b75b970 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [2.3.4] - 2024-??-??
+
+- Transfer OXID-Ordernumber to PayPal
+
 ## [2.3.3] - 2023-11-16
 
 - [0007549](https://bugs.oxid-esales.com/view.php?id=7549): Optional field in shop admin -> refund "Note to buyer" is transmitted to PayPal
diff --git a/metadata.php b/metadata.php
index 2f1b91442..1dbe46ea8 100644
--- a/metadata.php
+++ b/metadata.php
@@ -56,7 +56,7 @@
         'en' => 'Use of the online payment service from PayPal. Documentation: <a href="https://docs.oxid-esales.com/modules/paypal-checkout/en/latest/" target="_blank">PayPal Checkout</a>'
     ],
     'thumbnail' => 'out/img/paypal.png',
-    'version' => '2.3.3',
+    'version' => '2.3.4-rc.1',
     'author' => 'OXID eSales AG',
     'url' => 'https://www.oxid-esales.com',
     'email' => 'info@oxid-esales.com',
diff --git a/src/Controller/ProxyController.php b/src/Controller/ProxyController.php
index c445ab995..9553b2502 100644
--- a/src/Controller/ProxyController.php
+++ b/src/Controller/ProxyController.php
@@ -60,12 +60,12 @@ public function createOrder()
             null,
             '',
             '',
-            '',
             Constants::PAYPAL_PARTNER_ATTRIBUTION_ID_PPCP,
             null,
             null,
             false,
-            false
+            false,
+            null
         );
 
         if ($response->id) {
diff --git a/src/Core/OrderRequestFactory.php b/src/Core/OrderRequestFactory.php
index dc46afb56..d3443e86e 100644
--- a/src/Core/OrderRequestFactory.php
+++ b/src/Core/OrderRequestFactory.php
@@ -66,7 +66,7 @@ class OrderRequestFactory
      * @param Basket $basket
      * @param string $intent Order::INTENT_CAPTURE or Order::INTENT_AUTHORIZE constant values
      * @param null|string $userAction USER_ACTION_CONTINUE constant values
-     * @param null|string $transactionId transaction id
+     * @param null|string $customId custom id reference
      * @param null|string $processingInstruction processing instruction
      * @param null|string $paymentSource Payment-Source Name
      * @param null|string $invoiceId custom invoice number
@@ -81,7 +81,7 @@ public function getRequest(
         Basket $basket,
         string $intent,
         ?string $userAction = null,
-        ?string $transactionId = null,
+        ?string $customId = null,
         ?string $processingInstruction = null,
         ?string $paymentSource = null,
         ?string $invoiceId = null,
@@ -98,7 +98,7 @@ public function getRequest(
             $request->payer = $this->getPayer();
         }
 
-        $request->purchase_units = $this->getPurchaseUnits($transactionId, $invoiceId, $withArticles);
+        $request->purchase_units = $this->getPurchaseUnits($customId, $invoiceId, $withArticles);
 
         if ($userAction || $returnUrl || $cancelUrl) {
             $request->application_context = $this->getApplicationContext(
diff --git a/src/Model/PaymentGateway.php b/src/Model/PaymentGateway.php
index 16ac511c1..17cd1f6f7 100644
--- a/src/Model/PaymentGateway.php
+++ b/src/Model/PaymentGateway.php
@@ -100,6 +100,8 @@ protected function doExecutePuiPayment(EshopModelOrder $order): bool
 
         $success = false;
         try {
+            //order number must be resolved before requesting payment
+            $order->setOrderNumber();
             $success = $paymentService->doExecutePuiPayment(
                 $order,
                 Registry::getSession()->getBasket(),
diff --git a/src/Service/Payment.php b/src/Service/Payment.php
index 5309d188e..79b991d88 100644
--- a/src/Service/Payment.php
+++ b/src/Service/Payment.php
@@ -109,12 +109,12 @@ public function doCreatePayPalOrder(
         string $processingInstruction = null,
         string $paymentSource = null,
         string $payPalClientMetadataId = '',
-        string $payPalRequestId = '',
         string $payPalPartnerAttributionId = '',
         string $returnUrl = null,
         string $cancelUrl = null,
         bool $withArticles = true,
-        bool $setProvidedAddress = true
+        bool $setProvidedAddress = true,
+        ?EshopModelOrder $order = null
         #): ?ApiModelOrder
     ) {
         //TODO return value
@@ -127,7 +127,7 @@ public function doCreatePayPalOrder(
             $basket,
             $intent,
             $userAction,
-            null,
+            $order instanceof EshopModelOrder ? $order->getFieldData('oxordernr') : null,
             $processingInstruction,
             $paymentSource,
             null,
@@ -145,7 +145,7 @@ public function doCreatePayPalOrder(
                 $payPalPartnerAttributionId,
                 $payPalClientMetadataId,
                 'return=minimal',
-                $payPalRequestId
+                $order instanceof EshopModelOrder ? $order->getId() : null
             );
         } catch (ApiException $exception) {
             $this->moduleLogger->error("Api error on order create call. " .
@@ -172,7 +172,6 @@ public function doCreatePatchedOrder(
             null,
             null,
             '',
-            '',
             Constants::PAYPAL_PARTNER_ATTRIBUTION_ID_PPCP,
             null,
             null,
@@ -309,8 +308,16 @@ public function doCapturePayPalOrder(
                 $result = $this->fetchOrderFields($checkoutOrderId);
             } else {
                 $request = new OrderCaptureRequest();
+                //order number must be resolved before order patching
+                $order->setOrderNumber();
                 try {
-                    /** @var ApiOrderModel */
+                    //Patching the order with OXID order number as custom value
+                    $this->doPatchPayPalOrder(
+                        Registry::getSession()->getBasket(),
+                        $checkoutOrderId,
+                        $order->getFieldData('oxordernr')
+                    );
+                    /** @var $result ApiOrderModel */
                     $result = $orderService->capturePaymentForOrder(
                         '',
                         $checkoutOrderId,
@@ -345,7 +352,6 @@ public function doCapturePayPalOrder(
             );
 
             if ($result instanceof Order && $order->isPayPalOrderCompleted($result)) {
-                $order->setOrderNumber();
                 $order->markOrderPaid();
                 $order->setTransId((string)$payPalTransactionId);
             }
@@ -530,7 +536,6 @@ public function doExecuteStandardPayment(
             null,
             null,
             '',
-            '',
             Constants::PAYPAL_PARTNER_ATTRIBUTION_ID_PPCP,
             $returnUrl,
             $cancelUrl,
@@ -574,7 +579,6 @@ public function doCreateUAPMOrder(EshopModelBasket $basket): string
             null,
             null,
             '',
-            '',
             Constants::PAYPAL_PARTNER_ATTRIBUTION_ID_PPCP,
             null,
             null,
@@ -599,8 +603,12 @@ public function doExecutePuiPayment(
                 Constants::PAYPAL_PUI_PROCESSING_INSTRUCTIONS,
                 PayPalDefinitions::PUI_REQUEST_PAYMENT_SOURCE_NAME,
                 $payPalClientMetadataId,
-                $order->getId(),
-                Constants::PAYPAL_PARTNER_ATTRIBUTION_ID_PPCP
+                Constants::PAYPAL_PARTNER_ATTRIBUTION_ID_PPCP,
+                null,
+                null,
+                true,
+                true,
+                $order
             );
             $payPalOrderId = $result->id;
         } catch (UserPhoneException $e) {