Add cash-on-delivery payment type with cart fee pipeline

src/Payment/Pipelines/Cart/ApplyCashOnDeliveryFee.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Modules\Core\Payment\Pipelines\Cart;
+
+use Closure;
+use Lunar\DataTypes\Price;
+use Lunar\Models\Contracts\Cart as CartContract;
+
+final class ApplyCashOnDeliveryFee
+{
+    /**
+     * Called just before cart totals are calculated.
+     *
+     * @param  Closure(CartContract): mixed  $next
+     */
+    public function handle(CartContract $cart, Closure $next): mixed
+    {
+        if (($cart->meta['payment_method'] ?? null) === 'cash-on-delivery') {
+            $fee = (int) config('lunar.payments.types.cash-on-delivery.fee', 0);
+
+            $cart->shippingTotal = new Price(
+                ($cart->shippingTotal?->value ?? 0) + $fee,
+                $cart->currency,
+                1
+            );
+        }
+
+        return $next($cart);
+    }
+}