Fix presence channel authentication

src/AsyncClient.php

@@ -142,14 +142,14 @@ public function channel(string $channel): Observable
 
         $subscribe = $this->connected
             ->do(function (Event $event) use ($channel): void {
-                $authKey = null;
+                $authKey = $channelData = null;
 
                 if (str_starts_with($channel, 'private-') || str_starts_with($channel, 'presence-')) {
-                    $authKey = $this->generateAuthToken($channel, $event->getData()['socket_id']);
+                    [$authKey, $channelData] = $this->generateAuthToken($channel, $event->getData()['socket_id']);
                 }
 
                 // Subscribe to pusher channel after connected
-                $this->send(Event::subscribeOn($channel, $authKey));
+                $this->send(Event::subscribeOn($channel, $authKey, $channelData));
             })
             ->flatMapTo(Observable::empty());
 
@@ -265,7 +265,7 @@ private function handleLowLevelError(Throwable $throwable): Observable
     /**
      * @throws \Exception
      */
-    private function generateAuthToken(string $channel, string $socketId): string
+    private function generateAuthToken(string $channel, string $socketId): array
     {
         if (!$this->authEndpoint) {
             throw new \Exception('No auth endpoint is configured to connect private or presence channel.');
@@ -299,6 +299,6 @@ private function generateAuthToken(string $channel, string $socketId): string
             throw new \Exception('Invalid response for auth token.');
         }
 
-        return $response['auth'];
+        return [$response['auth'], $response['channel_data'] ?? null];
     }
 }