Add media property and getter to Promotion class

Added media property and corresponding getter method.

Author: freerkminnema

src/Models/Vouchers/Promotion.php

@@ -6,6 +6,7 @@
 use Piggy\Api\ApiClient;
 use Piggy\Api\Exceptions\MaintenanceModeException;
 use Piggy\Api\Exceptions\PiggyRequestException;
+use Piggy\Api\Models\Loyalty\Media;
 use Piggy\Api\StaticMappers\Vouchers\PromotionMapper;
 use Piggy\Api\StaticMappers\Vouchers\PromotionsMapper;
 
@@ -56,6 +57,11 @@ class Promotion
      */
     protected $attributes;
 
+    /**
+     * @var Media|null
+     */
+    protected $media;
+
     /**
      * @var string
      */
@@ -134,6 +140,11 @@ public function getAttributes(): array
         return $this->attributes;
     }
 
+    public function getMedia(): ?Media
+    {
+        return $this->media;
+    }
+
     /**
      * @param  mixed[]  $body
      *