Method to set a reference

Author: Leon

src/MessagebirdMessage.php

@@ -7,6 +7,7 @@ class MessagebirdMessage
     public $body;
     public $originator;
     public $recipients;
+    public $reference;
 
     public static function create($body = '')
     {
@@ -15,7 +16,7 @@ public static function create($body = '')
 
     public function __construct($body = '')
     {
-        if (! empty($body)) {
+        if (!empty($body)) {
             $this->body = trim($body);
         }
     }
@@ -45,6 +46,13 @@ public function setRecipients($recipients)
         return $this;
     }
 
+    public function setReference($reference)
+    {
+        $this->reference = $reference;
+
+        return $this;
+    }
+
     public function toJson()
     {
         return json_encode($this);