diff --git a/src/types/order.d.ts b/src/types/order.d.ts
index 9c29dfb..d0ef70d 100644
--- a/src/types/order.d.ts
+++ b/src/types/order.d.ts
@@ -108,6 +108,7 @@ export interface ShippingGroupBase extends Identifiable {
   relation: 'order'
   order_id?: string
   cart_id?: string
+  external_ref?: string
   shipping_type?: string
   tracking_reference?: string
   address?: OrderShippingAddress