PHPSDK-163: Fix PHP 8.4 deprecations (#366)

Author: vinodsowdagar

src/Api/TransactionManager.php

@@ -136,7 +136,7 @@ public function captureReservationCancel(string $orderId, CaptureRequest $captur
      * @return Response
      * @throws ClientExceptionInterface|ApiException
      */
-    public function refund(Transaction $transaction, RefundRequest $requestRefund, string $orderId = null): Response
+    public function refund(Transaction $transaction, RefundRequest $requestRefund, ?string $orderId = null): Response
     {
         return $this->client->createPostRequest(
             'json/orders/' . ($orderId ?: $transaction->getOrderId()) . '/refunds',

src/Api/Transactions/TransactionListing.php

@@ -25,7 +25,7 @@ class TransactionListing
      * @param array $data
      * @param Pager|null $pager
      */
-    public function __construct(array $data, Pager $pager = null)
+    public function __construct(array $data, ?Pager $pager = null)
     {
         $transactions = [];
         if (!empty($data)) {

src/Client/Client.php

@@ -108,7 +108,7 @@ public function __construct(
      */
     public function createPostRequest(
         string $endpoint,
-        RequestBodyInterface $requestBody = null,
+        ?RequestBodyInterface $requestBody = null,
         array $context = []
     ): ApiResponse {
         $request = $this->createRequest($endpoint, self::METHOD_POST)
@@ -133,7 +133,7 @@ public function createPostRequest(
      */
     public function createPatchRequest(
         string $endpoint,
-        RequestBodyInterface $requestBody = null,
+        ?RequestBodyInterface $requestBody = null,
         array $context = []
     ): ApiResponse {
         $request = $this->createRequest($endpoint, self::METHOD_PATCH)

src/Sdk.php

@@ -52,7 +52,7 @@ class Sdk
     public function __construct(
         string $apiKey,
         bool $isProduction,
-        ClientInterface $httpClient = null,
+        ?ClientInterface $httpClient = null,
         ?RequestFactoryInterface $requestFactory = null,
         ?StreamFactoryInterface $streamFactory = null,
         string $locale = 'en_US',

src/ValueObject/CartItem.php

@@ -101,7 +101,7 @@ public function addName(string $name): CartItem
      * @return $this
      * @throws InvalidArgumentException
      */
-    public function addUnitPriceValue(UnitPrice $unitPrice, float $taxRate = null): CartItem
+    public function addUnitPriceValue(UnitPrice $unitPrice, ?float $taxRate = null): CartItem
     {
         $this->unitPriceValue = $unitPrice;