Feature: Shipment Updates to handle COD

src/Shipping/DataTransferObjects/ShipmentRequest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Modules\Core\Shipping\DataTransferObjects;
+
+/**
+ * Carrier-agnostic input for CarrierFulfillmentInterface::createShipment().
+ * Every field is optional — a carrier reads only what it needs and ignores
+ * the rest (e.g. destinationLocationId only matters to locker-delivery
+ * carriers like Box Now; ACS has no use for it).
+ */
+class ShipmentRequest
+{
+    public function __construct(
+        public readonly ?float $weight = null,
+        public readonly int $packageCount = 1,
+        public readonly ?string $destinationLocationId = null,
+        public readonly ?string $paymentMode = null,
+        public readonly ?float $amountToCollect = null,
+    ) {}
+}