feat(API-1552): Add order_id and shipment_reference_identifier to…

… `ShipmentStatusChangeEvent`

src/api-reference/11.webhook-object-definitions.md

@@ -100,6 +100,14 @@ The shipment status.
 Data type: [string]  
 This is the shipment barcode.
 
+**shipment_reference_identifier**  
+Data type: [string]  
+This is the shipment reference identifier, which can contain the webshop order reference.
+
+**order_id**  
+Data type: [string]  
+This is the MyParcel order UUID to which the shipment belongs. Only present if the shipment is part of an <ApiLink to="13_A">Order</ApiLink>.
+
 ### 11.B.2 Reference
 
 We send the following headers to your environment:
@@ -119,7 +127,9 @@ We send the following headers to your environment:
   "account_id": 7003,
   "shop_id": 1897,
   "status": 2,
-  "barcode": "3SMYPA749883621"
+  "barcode": "3SMYPA749883621",
+  "shipment_reference_identifier": "Bol.com nr: 4161412988",
+  "order_id": "db610547-7434-4f6d-9e13-178b686a94d6"
 }
 ```
 
@@ -134,7 +144,9 @@ The above is an example of the ShipmentStatusChangeEvent Object. However, the fo
         "account_id": 7003,
         "shop_id": 1897,
         "status": 2,
-        "barcode": "3SMYPA749883621"
+        "barcode": "3SMYPA749883621",
+        "shipment_reference_identifier": "Bol.com nr: 4161412988",
+        "order_id": "db610547-7434-4f6d-9e13-178b686a94d6"
       }
     ]
   }