diff --git a/UPGRADE.md b/UPGRADE.md
index 9dfd6fc6..7a4779f3 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -12,9 +12,9 @@
      use GuzzleHttp\ClientInterface as GuzzleClientInterface;
      use Psr\Http\Message\RequestFactoryInterface;
      use Psr\Http\Message\StreamFactoryInterface;
-    
+
         public function __construct(
-    -      private readonly GuzzleClientInterface $client, 
+    -      private readonly GuzzleClientInterface $client,
     +      private readonly GuzzleClientInterface|ClientInterface $client,
             private readonly LoggerInterface $logger,
             private readonly UuidProviderInterface $uuidProvider,
@@ -33,7 +33,7 @@
      use Psr\Http\Client\ClientInterface;
      use GuzzleHttp\ClientInterface as GuzzleClientInterface;
      use Psr\Http\Message\RequestFactoryInterface;
-   
+
         public function __construct(
    -      private readonly GuzzleClientInterface $client,
    +      private readonly GuzzleClientInterface|ClientInterface $client,
@@ -47,7 +47,7 @@
      use GuzzleHttp\ClientInterface as GuzzleClientInterface;
      use Psr\Http\Message\RequestFactoryInterface;
      use Psr\Http\Message\StreamFactoryInterface;
-   
+
         public function __construct(
    -       private readonly GuzzleClientInterface $client,
    +       private readonly GuzzleClientInterface|ClientInterface $client,
@@ -62,7 +62,7 @@
       use Psr\Http\Client\ClientInterface;
       use GuzzleHttp\ClientInterface as GuzzleClientInterface;
       use Psr\Http\Message\RequestFactoryInterface;
-   
+
         public function __construct(
    -      private readonly GuzzleClientInterface $client,
    +      private readonly GuzzleClientInterface|ClientInterface $client,
@@ -71,7 +71,30 @@
    +      private readonly ?RequestFactoryInterface $requestFactory = null,
     )
      ```
-   
+
+   `Sylius\PayPalPlugin\Model\PayPalPurchaseUnit`:
+     ```diff
+      use Sylius\Component\Core\Model\AddressInterface;
+      use Webmozart\Assert\Assert;
+
+        public function __construct(
+            private readonly string $referenceId,
+            private readonly string $invoiceNumber,
+            private readonly string $currencyCode,
+            private readonly int $totalAmount,
+            private readonly int $shippingValue,
+            private readonly float $itemTotalValue,
+            private readonly float $taxTotalValue,
+            private readonly int $discountValue,
+            private readonly string $merchantId,
+            private readonly array $items,
+            private readonly bool $shippingRequired,
+            private readonly ?AddressInterface $shippingAddress = null,
+            private readonly string $softDescriptor = 'Sylius PayPal Payment',
+   +      private readonly int $shippingDiscountValue = 0,
+    )
+     ```
+
 1. Added doctrine migration for PostgreSQL. For more information, please refer to the [Sylius 1.13 UPGRADE.md](https://github.com/Sylius/Sylius/blob/1.13/UPGRADE-1.13.md)
 
 ### UPGRADE FROM 1.3.0 to 1.3.1
diff --git a/spec/Api/CreateOrderApiSpec.php b/spec/Api/CreateOrderApiSpec.php
index d78e47a3..042e312f 100644
--- a/spec/Api/CreateOrderApiSpec.php
+++ b/spec/Api/CreateOrderApiSpec.php
@@ -17,6 +17,7 @@
 use PhpSpec\ObjectBehavior;
 use Prophecy\Argument;
 use Sylius\Component\Core\Model\AddressInterface;
+use Sylius\Component\Core\Model\AdjustmentInterface;
 use Sylius\Component\Core\Model\OrderInterface;
 use Sylius\Component\Core\Model\PaymentInterface;
 use Sylius\Component\Core\Model\PaymentMethodInterface;
@@ -57,6 +58,7 @@ function it_creates_pay_pal_order_based_on_given_payment(
         $order->getShippingTotal()->willReturn(1000);
         $order->isShippingRequired()->willReturn(true);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $payPalItemDataProvider->provide($order)->willReturn([
             'items' => [
@@ -92,7 +94,7 @@ function it_creates_pay_pal_order_based_on_given_payment(
             Argument::that(function (array $data): bool {
                 return
                     $data['intent'] === 'CAPTURE' &&
-                    $data['purchase_units'][0]['invoice_number'] === 'REFERENCE-NUMBER' &&
+                    $data['purchase_units'][0]['invoice_id'] === 'REFERENCE-NUMBER' &&
                     $data['purchase_units'][0]['amount']['value'] === '100.00' &&
                     $data['purchase_units'][0]['amount']['currency_code'] === 'PLN' &&
                     $data['purchase_units'][0]['amount']['breakdown']['shipping']['currency_code'] === 'PLN' &&
@@ -126,6 +128,7 @@ function it_creates_pay_pal_order_with_shipping_address_based_on_given_payment(
         $order->getShippingTotal()->willReturn(1000);
         $order->isShippingRequired()->willReturn(true);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $shippingAddress->getFullName()->willReturn('Gandalf The Grey');
         $shippingAddress->getStreet()->willReturn('Hobbit St. 123');
@@ -167,7 +170,7 @@ function it_creates_pay_pal_order_with_shipping_address_based_on_given_payment(
             Argument::that(function (array $data): bool {
                 return
                     $data['intent'] === 'CAPTURE' &&
-                    $data['purchase_units'][0]['invoice_number'] === 'REFERENCE-NUMBER' &&
+                    $data['purchase_units'][0]['invoice_id'] === 'REFERENCE-NUMBER' &&
                     $data['purchase_units'][0]['amount']['value'] === '100.00' &&
                     $data['purchase_units'][0]['amount']['currency_code'] === 'PLN' &&
                     $data['purchase_units'][0]['shipping']['name']['full_name'] === 'Gandalf The Grey' &&
@@ -204,6 +207,7 @@ function it_creates_pay_pal_order_with_more_than_one_product(
         $order->getShippingTotal()->willReturn(3000);
         $order->isShippingRequired()->willReturn(true);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $shippingAddress->getFullName()->willReturn('Gandalf The Grey');
         $shippingAddress->getStreet()->willReturn('Hobbit St. 123');
@@ -297,6 +301,7 @@ function it_creates_pay_pal_order_with_non_neutral_tax_and_changed_quantity(
         $order->getShippingTotal()->willReturn(1000);
         $order->isShippingRequired()->willReturn(true);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $shippingAddress->getFullName()->willReturn('Gandalf The Grey');
         $shippingAddress->getStreet()->willReturn('Hobbit St. 123');
@@ -394,6 +399,7 @@ function it_creates_pay_pal_order_with_more_than_one_product_with_different_tax_
         $order->getShippingTotal()->willReturn(3000);
         $order->isShippingRequired()->willReturn(true);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $shippingAddress->getFullName()->willReturn('Gandalf The Grey');
         $shippingAddress->getStreet()->willReturn('Hobbit St. 123');
@@ -509,6 +515,7 @@ function it_allows_to_create_digital_order(
         $order->getShippingTotal()->willReturn(0);
         $order->isShippingRequired()->willReturn(false);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $payPalItemDataProvider->provide($order)->willReturn([
             'items' => [
@@ -573,6 +580,7 @@ function it_creates_pay_pal_order_with_promotion(
         $order->getShippingTotal()->willReturn(749);
         $order->isShippingRequired()->willReturn(true);
         $order->getOrderPromotionTotal()->willReturn(-250);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $payPalItemDataProvider->provide($order)->willReturn([
             'items' => [
@@ -608,7 +616,7 @@ function it_creates_pay_pal_order_with_promotion(
             Argument::that(function (array $data): bool {
                 return
                     $data['intent'] === 'CAPTURE' &&
-                    $data['purchase_units'][0]['invoice_number'] === 'REFERENCE-NUMBER' &&
+                    $data['purchase_units'][0]['invoice_id'] === 'REFERENCE-NUMBER' &&
                     $data['purchase_units'][0]['amount']['value'] === '29.99' &&
                     $data['purchase_units'][0]['amount']['currency_code'] === 'PLN' &&
                     $data['purchase_units'][0]['amount']['breakdown']['shipping']['currency_code'] === 'PLN' &&
@@ -627,4 +635,80 @@ function it_creates_pay_pal_order_with_promotion(
 
         $this->create('TOKEN', $payment, 'REFERENCE_ID')->shouldReturn(['status' => 'CREATED', 'id' => 123]);
     }
+
+    function it_creates_pay_pal_order_with_shipping_promotion(
+        PayPalClientInterface $client,
+        PaymentReferenceNumberProviderInterface $paymentReferenceNumberProvider,
+        PaymentInterface $payment,
+        OrderInterface $order,
+        PaymentMethodInterface $paymentMethod,
+        GatewayConfigInterface $gatewayConfig,
+        PayPalItemDataProviderInterface $payPalItemDataProvider,
+    ): void {
+        $payment->getOrder()->willReturn($order);
+        $payment->getAmount()->willReturn(3000);
+        $order->getCurrencyCode()->willReturn('PLN');
+        $order->getShippingAddress()->willReturn(null);
+        $order->getItemsTotal()->willReturn(2500);
+        $order->getShippingTotal()->willReturn(500);
+        $order->isShippingRequired()->willReturn(true);
+        $order->getOrderPromotionTotal()->willReturn(0);
+        $order
+            ->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)
+            ->willReturn(-249)
+        ;
+
+        $payPalItemDataProvider->provide($order)->willReturn([
+            'items' => [
+                [
+                    'name' => 'PRODUCT_ONE',
+                    'unit_amount' => [
+                        'value' => '25.00',
+                        'currency_code' => 'PLN',
+                    ],
+                    'quantity' => 1,
+                    'tax' => [
+                        'value' => '0.00',
+                        'currency_code' => 'PLN',
+                    ],
+                ],
+            ],
+            'total_item_value' => '25.00',
+            'total_tax' => '0.00',
+        ]);
+
+        $payment->getMethod()->willReturn($paymentMethod);
+        $paymentMethod->getGatewayConfig()->willReturn($gatewayConfig);
+
+        $paymentReferenceNumberProvider->provide($payment)->willReturn('REFERENCE-NUMBER');
+
+        $gatewayConfig->getConfig()->willReturn(
+            ['merchant_id' => 'merchant-id', 'sylius_merchant_id' => 'sylius-merchant-id'],
+        );
+
+        $client->post(
+            'v2/checkout/orders',
+            'TOKEN',
+            Argument::that(function (array $data): bool {
+                return
+                    $data['intent'] === 'CAPTURE' &&
+                    $data['purchase_units'][0]['invoice_id'] === 'REFERENCE-NUMBER' &&
+                    $data['purchase_units'][0]['amount']['value'] === '30.00' &&
+                    $data['purchase_units'][0]['amount']['currency_code'] === 'PLN' &&
+                    $data['purchase_units'][0]['amount']['breakdown']['shipping']['currency_code'] === 'PLN' &&
+                    $data['purchase_units'][0]['amount']['breakdown']['shipping']['value'] === '7.49' &&
+                    $data['purchase_units'][0]['amount']['breakdown']['item_total']['currency_code'] === 'PLN' &&
+                    $data['purchase_units'][0]['amount']['breakdown']['item_total']['value'] === '25.00' &&
+                    $data['purchase_units'][0]['amount']['breakdown']['shipping_discount']['currency_code'] === 'PLN' &&
+                    $data['purchase_units'][0]['amount']['breakdown']['shipping_discount']['value'] === '2.49' &&
+                    $data['purchase_units'][0]['items'][0]['name'] === 'PRODUCT_ONE' &&
+                    $data['purchase_units'][0]['items'][0]['quantity'] === 1 &&
+                    $data['purchase_units'][0]['items'][0]['unit_amount']['value'] === '25.00' &&
+                    $data['purchase_units'][0]['items'][0]['unit_amount']['currency_code'] === 'PLN'
+                ;
+            }),
+        )->willReturn(['status' => 'CREATED', 'id' => 123]);
+
+        $this->create('TOKEN', $payment, 'REFERENCE_ID')->shouldReturn(['status' => 'CREATED', 'id' => 123]);
+    }
 }
diff --git a/spec/Api/RefundPaymentApiSpec.php b/spec/Api/RefundPaymentApiSpec.php
index e7383965..5bd13146 100644
--- a/spec/Api/RefundPaymentApiSpec.php
+++ b/spec/Api/RefundPaymentApiSpec.php
@@ -35,7 +35,7 @@ function it_refunds_pay_pal_payment_with_given_id(PayPalClientInterface $client)
             ->post(
                 'v2/payments/captures/123123/refund',
                 'TOKEN',
-                ['amount' => ['value' => '10.99', 'currency_code' => 'USD'], 'invoice_number' => '123-11-11-2010'],
+                ['amount' => ['value' => '10.99', 'currency_code' => 'USD'], 'invoice_id' => '123-11-11-2010'],
                 ['PayPal-Auth-Assertion' => 'PAY-PAL-AUTH-ASSERTION'],
             )
             ->willReturn(['status' => 'COMPLETED', 'id' => '123123'])
diff --git a/spec/Api/UpdateOrderApiSpec.php b/spec/Api/UpdateOrderApiSpec.php
index 0bbf97db..203820d1 100644
--- a/spec/Api/UpdateOrderApiSpec.php
+++ b/spec/Api/UpdateOrderApiSpec.php
@@ -16,6 +16,7 @@
 use PhpSpec\ObjectBehavior;
 use Prophecy\Argument;
 use Sylius\Component\Core\Model\AddressInterface;
+use Sylius\Component\Core\Model\AdjustmentInterface;
 use Sylius\Component\Core\Model\OrderInterface;
 use Sylius\Component\Core\Model\PaymentInterface;
 use Sylius\PayPalPlugin\Api\UpdateOrderApiInterface;
@@ -55,12 +56,13 @@ function it_updates_pay_pal_order_with_given_new_total(
             ->willReturn(['items' => ['data'], 'total_item_value' => '10.00', 'total_tax' => '1.00'])
         ;
 
-        $paymentReferenceNumberProvider->provide($payment)->willReturn('INVOICE_NUMBER');
+        $paymentReferenceNumberProvider->provide($payment)->willReturn('INVOICE_ID');
 
         $order->getTotal()->willReturn(1122);
         $order->getCurrencyCode()->willReturn('USD');
         $order->getShippingTotal()->willReturn(22);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $shippingAddress->getFullName()->willReturn('John Doe');
         $shippingAddress->getStreet()->willReturn('Main St. 123');
@@ -78,7 +80,7 @@ function it_updates_pay_pal_order_with_given_new_total(
                     $data[0]['op'] === 'replace' &&
                     $data[0]['path'] === '/purchase_units/@reference_id==\'REFERENCE-ID\'' &&
                     $data[0]['value']['reference_id'] === 'REFERENCE-ID' &&
-                    $data[0]['value']['invoice_number'] === 'INVOICE_NUMBER' &&
+                    $data[0]['value']['invoice_id'] === 'INVOICE_ID' &&
                     $data[0]['value']['amount']['value'] === '11.22' &&
                     $data[0]['value']['amount']['currency_code'] === 'USD' &&
                     $data[0]['value']['amount']['breakdown']['shipping']['value'] === '0.22' &&
@@ -115,12 +117,13 @@ function it_updates_digital_order(
             ->willReturn(['items' => ['data'], 'total_item_value' => '10.00', 'total_tax' => '1.22'])
         ;
 
-        $paymentReferenceNumberProvider->provide($payment)->willReturn('INVOICE_NUMBER');
+        $paymentReferenceNumberProvider->provide($payment)->willReturn('INVOICE_ID');
 
         $order->getTotal()->willReturn(1122);
         $order->getCurrencyCode()->willReturn('USD');
         $order->getShippingTotal()->willReturn(0);
         $order->getOrderPromotionTotal()->willReturn(0);
+        $order->getAdjustmentsTotalRecursively(AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT)->willReturn(0);
 
         $order->isShippingRequired()->willReturn(false);
 
@@ -132,7 +135,7 @@ function it_updates_digital_order(
                     $data[0]['op'] === 'replace' &&
                     $data[0]['path'] === '/purchase_units/@reference_id==\'REFERENCE-ID\'' &&
                     $data[0]['value']['reference_id'] === 'REFERENCE-ID' &&
-                    $data[0]['value']['invoice_number'] === 'INVOICE_NUMBER' &&
+                    $data[0]['value']['invoice_id'] === 'INVOICE_ID' &&
                     $data[0]['value']['amount']['value'] === '11.22' &&
                     $data[0]['value']['amount']['currency_code'] === 'USD' &&
                     $data[0]['value']['amount']['breakdown']['shipping']['value'] === '0.00' &&
diff --git a/spec/Model/PayPalOrderSpec.php b/spec/Model/PayPalOrderSpec.php
index d08b1b9c..5698054e 100644
--- a/spec/Model/PayPalOrderSpec.php
+++ b/spec/Model/PayPalOrderSpec.php
@@ -36,7 +36,7 @@ public function it_returns_full_paypal_order_data(
         $payPalPurchaseUnit->toArray()->willReturn(
             [
                 'reference_id' => 'REFERENCE_ID',
-                'invoice_number' => 'INVOICE_NUMBER',
+                'invoice_id' => 'INVOICE_ID',
                 'amount' => [
                     'currency_code' => 'CURRENCY_CODE',
                     'value' => 100,
@@ -86,7 +86,7 @@ public function it_returns_full_paypal_order_data(
                 'purchase_units' => [
                     [
                         'reference_id' => 'REFERENCE_ID',
-                        'invoice_number' => 'INVOICE_NUMBER',
+                        'invoice_id' => 'INVOICE_ID',
                         'amount' => [
                             'currency_code' => 'CURRENCY_CODE',
                             'value' => 100,
@@ -146,7 +146,7 @@ public function it_returns_paypal_order_data_without_shipping_address(
         $payPalPurchaseUnit->toArray()->willReturn(
             [
                 'reference_id' => 'REFERENCE_ID',
-                'invoice_number' => 'INVOICE_NUMBER',
+                'invoice_id' => 'INVOICE_ID',
                 'amount' => [
                     'currency_code' => 'CURRENCY_CODE',
                     'value' => 100,
@@ -185,7 +185,7 @@ public function it_returns_paypal_order_data_without_shipping_address(
                 'purchase_units' => [
                     [
                         'reference_id' => 'REFERENCE_ID',
-                        'invoice_number' => 'INVOICE_NUMBER',
+                        'invoice_id' => 'INVOICE_ID',
                         'amount' => [
                             'currency_code' => 'CURRENCY_CODE',
                             'value' => 100,
@@ -234,7 +234,7 @@ public function it_returns_paypal_order_data_if_shipping_is_not_required(
         $payPalPurchaseUnit->toArray()->willReturn(
             [
                 'reference_id' => 'REFERENCE_ID',
-                'invoice_number' => 'INVOICE_NUMBER',
+                'invoice_id' => 'INVOICE_ID',
                 'amount' => [
                     'currency_code' => 'CURRENCY_CODE',
                     'value' => 100,
@@ -273,7 +273,7 @@ public function it_returns_paypal_order_data_if_shipping_is_not_required(
                 'purchase_units' => [
                     [
                         'reference_id' => 'REFERENCE_ID',
-                        'invoice_number' => 'INVOICE_NUMBER',
+                        'invoice_id' => 'INVOICE_ID',
                         'amount' => [
                             'currency_code' => 'CURRENCY_CODE',
                             'value' => 100,
diff --git a/spec/Model/PayPalPurchaseUnitSpec.php b/spec/Model/PayPalPurchaseUnitSpec.php
index 72656a81..d174f26f 100644
--- a/spec/Model/PayPalPurchaseUnitSpec.php
+++ b/spec/Model/PayPalPurchaseUnitSpec.php
@@ -22,7 +22,7 @@ function let(AddressInterface $shippingAddress): void
     {
         $this->beConstructedWith(
             'REFERENCE_ID',
-            'INVOICE_NUMBER',
+            'INVOICE_ID',
             'CURRENCY_CODE',
             10000,
             1000,
@@ -48,7 +48,7 @@ function it_returns_proper_paypal_purchase_unit(AddressInterface $shippingAddres
         $this->toArray()->shouldReturn(
             [
                 'reference_id' => 'REFERENCE_ID',
-                'invoice_number' => 'INVOICE_NUMBER',
+                'invoice_id' => 'INVOICE_ID',
                 'amount' => [
                     'currency_code' => 'CURRENCY_CODE',
                     'value' => '100.00',
@@ -69,6 +69,10 @@ function it_returns_proper_paypal_purchase_unit(AddressInterface $shippingAddres
                             'currency_code' => 'CURRENCY_CODE',
                             'value' => '0.00',
                         ],
+                        'shipping_discount' => [
+                            'currency_code' => 'CURRENCY_CODE',
+                            'value' => '0.00',
+                        ],
                     ],
                 ],
                 'payee' => [
@@ -97,7 +101,7 @@ function it_returns_proper_paypal_purchase_unit_if_shipping_is_not_required(Addr
     {
         $this->beConstructedWith(
             'REFERENCE_ID',
-            'INVOICE_NUMBER',
+            'INVOICE_ID',
             'CURRENCY_CODE',
             10000,
             1000,
@@ -113,7 +117,7 @@ function it_returns_proper_paypal_purchase_unit_if_shipping_is_not_required(Addr
         $this->toArray()->shouldReturn(
             [
                 'reference_id' => 'REFERENCE_ID',
-                'invoice_number' => 'INVOICE_NUMBER',
+                'invoice_id' => 'INVOICE_ID',
                 'amount' => [
                     'currency_code' => 'CURRENCY_CODE',
                     'value' => '100.00',
@@ -134,6 +138,10 @@ function it_returns_proper_paypal_purchase_unit_if_shipping_is_not_required(Addr
                             'currency_code' => 'CURRENCY_CODE',
                             'value' => '0.00',
                         ],
+                        'shipping_discount' => [
+                            'currency_code' => 'CURRENCY_CODE',
+                            'value' => '0.00',
+                        ],
                     ],
                 ],
                 'payee' => [
@@ -151,7 +159,7 @@ function it_returns_proper_paypal_purchase_unit_if_shipping_is_not_set(): void
     {
         $this->beConstructedWith(
             'REFERENCE_ID',
-            'INVOICE_NUMBER',
+            'INVOICE_ID',
             'CURRENCY_CODE',
             10000,
             1000,
@@ -167,7 +175,7 @@ function it_returns_proper_paypal_purchase_unit_if_shipping_is_not_set(): void
         $this->toArray()->shouldReturn(
             [
                 'reference_id' => 'REFERENCE_ID',
-                'invoice_number' => 'INVOICE_NUMBER',
+                'invoice_id' => 'INVOICE_ID',
                 'amount' => [
                     'currency_code' => 'CURRENCY_CODE',
                     'value' => '100.00',
@@ -188,6 +196,10 @@ function it_returns_proper_paypal_purchase_unit_if_shipping_is_not_set(): void
                             'currency_code' => 'CURRENCY_CODE',
                             'value' => '0.00',
                         ],
+                        'shipping_discount' => [
+                            'currency_code' => 'CURRENCY_CODE',
+                            'value' => '0.00',
+                        ],
                     ],
                 ],
                 'payee' => [
diff --git a/src/Api/CreateOrderApi.php b/src/Api/CreateOrderApi.php
index ac197631..b196e9af 100644
--- a/src/Api/CreateOrderApi.php
+++ b/src/Api/CreateOrderApi.php
@@ -14,6 +14,7 @@
 namespace Sylius\PayPalPlugin\Api;
 
 use Sylius\Bundle\PayumBundle\Model\GatewayConfigInterface;
+use Sylius\Component\Core\Model\AdjustmentInterface;
 use Sylius\Component\Core\Model\OrderInterface;
 use Sylius\Component\Core\Model\PaymentInterface;
 use Sylius\Component\Core\Model\PaymentMethodInterface;
@@ -62,12 +63,16 @@ public function create(string $token, PaymentInterface $payment, string $referen
         Assert::keyExists($config, 'merchant_id');
         Assert::keyExists($config, 'sylius_merchant_id');
 
+        $shippingDiscount = $order->getAdjustmentsTotalRecursively(
+            AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT,
+        );
+
         $payPalPurchaseUnit = new PayPalPurchaseUnit(
             $referenceId,
             $this->paymentReferenceNumberProvider->provide($payment),
             (string) $order->getCurrencyCode(),
             (int) $payment->getAmount(),
-            $order->getShippingTotal(),
+            $order->getShippingTotal() - $shippingDiscount,
             (float) $payPalItemData['total_item_value'],
             (float) $payPalItemData['total_tax'],
             $order->getOrderPromotionTotal(),
@@ -75,6 +80,7 @@ public function create(string $token, PaymentInterface $payment, string $referen
             (array) $payPalItemData['items'],
             $order->isShippingRequired(),
             $order->getShippingAddress(),
+            shippingDiscountValue: $shippingDiscount,
         );
 
         $payPalOrder = new PayPalOrder($order, $payPalPurchaseUnit, self::PAYPAL_INTENT_CAPTURE);
diff --git a/src/Api/RefundPaymentApi.php b/src/Api/RefundPaymentApi.php
index cb9e4ce2..aaa40d9a 100644
--- a/src/Api/RefundPaymentApi.php
+++ b/src/Api/RefundPaymentApi.php
@@ -35,7 +35,7 @@ public function refund(
         return $this->client->post(
             sprintf('v2/payments/captures/%s/refund', $paymentId),
             $token,
-            ['amount' => ['value' => $amount, 'currency_code' => $currencyCode], 'invoice_number' => $invoiceNumber],
+            ['amount' => ['value' => $amount, 'currency_code' => $currencyCode], 'invoice_id' => $invoiceNumber],
             ['PayPal-Auth-Assertion' => $payPalAuthAssertion],
         );
     }
diff --git a/src/Api/UpdateOrderApi.php b/src/Api/UpdateOrderApi.php
index 20b6ec7d..7989b371 100644
--- a/src/Api/UpdateOrderApi.php
+++ b/src/Api/UpdateOrderApi.php
@@ -13,6 +13,7 @@
 
 namespace Sylius\PayPalPlugin\Api;
 
+use Sylius\Component\Core\Model\AdjustmentInterface;
 use Sylius\Component\Core\Model\OrderInterface;
 use Sylius\Component\Core\Model\PaymentInterface;
 use Sylius\PayPalPlugin\Client\PayPalClientInterface;
@@ -50,12 +51,16 @@ public function update(
 
         $payPalItemData = $this->payPalItemsDataProvider->provide($order);
 
+        $shippingDiscount = $order->getAdjustmentsTotalRecursively(
+            AdjustmentInterface::ORDER_SHIPPING_PROMOTION_ADJUSTMENT,
+        );
+
         $data = new PayPalPurchaseUnit(
             $referenceId,
             $this->paymentReferenceNumberProvider->provide($payment),
             (string) $order->getCurrencyCode(),
             (int) $payment->getAmount(),
-            $order->getShippingTotal(),
+            $order->getShippingTotal() - $shippingDiscount,
             (float) $payPalItemData['total_item_value'],
             (float) $payPalItemData['total_tax'],
             $order->getOrderPromotionTotal(),
@@ -63,6 +68,7 @@ public function update(
             (array) $payPalItemData['items'],
             $order->isShippingRequired(),
             $order->getShippingAddress(),
+            shippingDiscountValue: $shippingDiscount,
         );
 
         return $this->client->patch(
diff --git a/src/Model/PayPalPurchaseUnit.php b/src/Model/PayPalPurchaseUnit.php
index e28f76f8..d587fa7e 100644
--- a/src/Model/PayPalPurchaseUnit.php
+++ b/src/Model/PayPalPurchaseUnit.php
@@ -18,80 +18,29 @@
 
 class PayPalPurchaseUnit
 {
-    /** @var string */
-    private $referenceId;
-
-    /** @var string */
-    private $invoiceNumber;
-
-    /** @var string */
-    private $currencyCode;
-
-    /** @var int */
-    private $totalAmount;
-
-    /** @var int */
-    private $shippingValue;
-
-    /** @var float */
-    private $itemTotalValue;
-
-    /** @var float */
-    private $taxTotalValue;
-
-    /** @var int */
-    private $discountValue;
-
-    /** @var string */
-    private $softDescriptor;
-
-    /** @var string */
-    private $merchantId;
-
-    /** @var ?AddressInterface */
-    private $shippingAddress;
-
-    /** @var bool */
-    private $shippingRequired;
-
-    /** @var array */
-    private $items;
-
     public function __construct(
-        string $referenceId,
-        string $invoiceNumber,
-        string $currencyCode,
-        int $totalAmount,
-        int $shippingValue,
-        float $itemTotalValue,
-        float $taxTotalValue,
-        int $discountValue,
-        string $merchantId,
-        array $items,
-        bool $shippingRequired,
-        ?AddressInterface $shippingAddress = null,
-        string $softDescriptor = 'Sylius PayPal Payment',
+        private readonly string $referenceId,
+        private readonly string $invoiceNumber,
+        private readonly string $currencyCode,
+        private readonly int $totalAmount,
+        private readonly int $shippingValue,
+        private readonly float $itemTotalValue,
+        private readonly float $taxTotalValue,
+        private readonly int $discountValue,
+        private readonly string $merchantId,
+        private readonly array $items,
+        private readonly bool $shippingRequired,
+        private readonly ?AddressInterface $shippingAddress = null,
+        private readonly string $softDescriptor = 'Sylius PayPal Payment',
+        private readonly int $shippingDiscountValue = 0,
     ) {
-        $this->referenceId = $referenceId;
-        $this->invoiceNumber = $invoiceNumber;
-        $this->currencyCode = $currencyCode;
-        $this->totalAmount = $totalAmount;
-        $this->shippingValue = $shippingValue;
-        $this->itemTotalValue = $itemTotalValue;
-        $this->taxTotalValue = $taxTotalValue;
-        $this->discountValue = $discountValue;
-        $this->merchantId = $merchantId;
-        $this->items = $items;
-        $this->shippingRequired = $shippingRequired;
-        $this->shippingAddress = $shippingAddress;
-        $this->softDescriptor = $softDescriptor;
     }
 
     public function toArray(): array
     {
         $paypalPurchaseUnit = [
             'reference_id' => $this->referenceId,
-            'invoice_number' => $this->invoiceNumber,
+            'invoice_id' => $this->invoiceNumber,
             'amount' => [
                 'currency_code' => $this->currencyCode,
                 'value' => number_format($this->totalAmount / 100, 2, '.', ''),
@@ -112,6 +61,10 @@ public function toArray(): array
                         'currency_code' => $this->currencyCode,
                         'value' => number_format(abs($this->discountValue) / 100, 2, '.', ''),
                     ],
+                    'shipping_discount' => [
+                        'currency_code' => $this->currencyCode,
+                        'value' => number_format(abs($this->shippingDiscountValue) / 100, 2, '.', ''),
+                    ],
                 ],
             ],
             'payee' => [