feat(order-model): references could be empty when send as response

src/models/Order.ts

@@ -8,7 +8,7 @@ import type { ShoppingCartInput } from './ShoppingCartInput.js';
 export interface Order {
   amountOfMoney?: AmountOfMoney;
   customer?: Customer;
-  references: References;
+  references?: References;
   shipping?: Shipping;
   shoppingCart?: ShoppingCartInput;
 }