fix: Prevents invalid stream for null payloads (#4)

fix: Prevents invalid stream for null payloads
docs(release): 0.1.1

Resolves: #3

CHANGELOG.md

@@ -8,6 +8,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 Check our main [developer changelog](https://developer.paddle.com/?utm_source=dx&utm_medium=paddle-php-sdk) for information about changes to the Paddle Billing platform, the Paddle API, and other developer tools.
 
+## 0.1.1 - 2024-01-15
+
+### Fixed
+
+- Resolved invalid streams being created for null payloads
+
 ## dev - 2024-01-10
 
 ### Added

src/Client.php

@@ -51,7 +51,7 @@
 
 class Client
 {
-    private const SDK_VERSION = '0.1.0';
+    private const SDK_VERSION = '0.1.1';
 
     public readonly LoggerInterface $logger;
     public readonly Options $options;
@@ -176,12 +176,14 @@ private function requestRaw(string $method, string|UriInterface $uri, array|\Jso
             [new JsonEncoder()],
         );
 
-        $body = $serializer->serialize($payload, 'json');
+        if ($payload !== null) {
+            $body = $serializer->serialize($payload, 'json');
 
-        $request = $request->withBody(
-            // Satisfies empty body requests.
-            $this->streamFactory->createStream($body === '[]' ? '{}' : $body),
-        );
+            $request = $request->withBody(
+                // Satisfies empty body requests.
+                $this->streamFactory->createStream($body === '[]' ? '{}' : $body),
+            );
+        }
 
         $request = $request->withAddedHeader('X-Transaction-ID', $this->transactionId ?? (string) new Ulid());