Feature: Creating Shipping Carrier Contracts

src/Shipping/Contracts/CarrierFulfillmentInterface.php

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+<?php
+
+namespace Modules\Core\Shipping\Contracts;
+
+use Lunar\Models\Order;
+use Modules\Core\Shipping\Models\Shipment;
+
+interface CarrierFulfillmentInterface
+{
+    /**
+     * Create a shipment with the carrier for the given order.
+     */
+    public function createShipment(Order $order, array $overrides = []): Shipment;
+
+    /**
+     * Fetch the printable label for a shipment (raw file bytes).
+     */
+    public function printLabel(Shipment $shipment): string;
+
+    /**
+     * Cancel a shipment with the carrier.
+     */
+    public function cancelShipment(Shipment $shipment): void;
+}