first upload all files

Modules/Tax/Http/Controllers/CartTaxController.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Modules\Tax\Http\Controllers;
+
+use Illuminate\Http\Request;
+use Modules\Cart\Facades\Cart;
+
+class CartTaxController
+{
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param \Illuminate\Http\Request $request
+     * @return \Illuminate\Http\Response
+     */
+    public function store(Request $request)
+    {
+        $this->mergeShippingAddress($request);
+
+        Cart::addTaxes($request);
+
+        return Cart::instance();
+    }
+
+    private function mergeShippingAddress($request)
+    {
+        $request->merge([
+            'shipping' => $request->ship_to_a_different_address ? $request->shipping : $request->billing,
+        ]);
+    }
+}