first upload all files

Modules/Order/OrderCollection.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Modules\Order;
+
+use Modules\Support\Money;
+use Modules\Order\Entities\Order;
+use Illuminate\Support\Collection;
+
+class OrderCollection extends Collection
+{
+    public function sumTotal()
+    {
+        $total = $this->sum(function (Order $order) {
+            return $order->total->amount();
+        });
+
+        return Money::inDefaultCurrency($total);
+    }
+}