Add support for notification reference

Author: andreascreten

src/Notification.php

@@ -6,6 +6,8 @@
 
 class Notification
 {
+    protected ?string $reference = null;
+
     protected string $title;
 
     protected string $body;
@@ -22,6 +24,13 @@ public static function new()
         return new static(new Client);
     }
 
+    public function reference(string $reference): self
+    {
+        $this->reference = $reference;
+
+        return $this;
+    }
+
     public function title(string $title): self
     {
         $this->title = $title;
@@ -43,12 +52,17 @@ public function message(string $body): self
         return $this;
     }
 
-    public function show(): void
+    public function show(): self
     {
-        $this->client->post('notification', [
+        $response = $this->client->post('notification', [
+            'reference' => $this->reference,
             'title' => $this->title,
             'body' => $this->body,
             'event' => $this->event,
         ]);
+
+        $this->reference = $response->json('reference');
+
+        return $this;
     }
 }