first upload all files

Modules/Shipping/Method.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Modules\Shipping;
+
+use Modules\Support\Money;
+use Modules\Cart\Facades\Cart;
+
+class Method
+{
+    public $name;
+    public $label;
+    public $cost;
+
+    public function __construct($name, $label, $cost)
+    {
+        $this->name = $name;
+        $this->label = $label;
+        $this->cost = Money::inDefaultCurrency($cost);
+    }
+
+    public function available()
+    {
+        if ($this->name !== 'free_shipping') {
+            return true;
+        }
+
+        return $this->freeShippingMethodIsAvailable();
+    }
+
+    private function freeShippingMethodIsAvailable()
+    {
+        $minimumAmount = Money::inDefaultCurrency(setting('free_shipping_min_amount'));
+
+        return Cart::subTotal()->greaterThanOrEqual($minimumAmount);
+    }
+}