first upload all files

Modules/Checkout/Http/Controllers/CheckoutController.php

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+<?php
+
+namespace Modules\Checkout\Http\Controllers;
+
+use Exception;
+use Modules\Support\Country;
+use Modules\Cart\Facades\Cart;
+use Modules\Page\Entities\Page;
+use Illuminate\Routing\Controller;
+use Modules\Payment\Facades\Gateway;
+use Modules\User\Services\CustomerService;
+use Modules\Checkout\Services\OrderService;
+use Modules\Address\Entities\DefaultAddress;
+use Modules\Cart\Http\Middleware\CheckCartStock;
+use Modules\Order\Http\Requests\StoreOrderRequest;
+use Modules\Cart\Http\Middleware\CheckCouponUsageLimit;
+use Modules\Cart\Http\Middleware\RedirectIfCartIsEmpty;
+
+class CheckoutController extends Controller
+{
+    /**
+     * Create a new controller instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        $this->middleware([
+            RedirectIfCartIsEmpty::class,
+            CheckCartStock::class,
+            CheckCouponUsageLimit::class,
+        ]);
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function create()
+    {
+        Gateway::all();
+        return view('public.checkout.create', [
+            'cart' => Cart::instance(),
+            'countries' => Country::supported(),
+            'gateways' => Gateway::all(),
+            'defaultAddress' => auth()->user()->defaultAddress ?? new DefaultAddress,
+            'addresses' => $this->getAddresses(),
+            'termsPageURL' => Page::urlForPage(setting('storefront_terms_page')),
+        ]);
+    }
+
+    /**
+     * Get addresses for the logged in user.
+     *
+     * @return \Illuminate\Support\Collection
+     */
+    private function getAddresses()
+    {
+        if (auth()->guest()) {
+            return collect();
+        }
+
+        return auth()->user()->addresses->keyBy('id');
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param \Modules\Order\Http\Requests\StoreOrderRequest $request
+     * @param \Modules\User\Services\CustomerService $customerService
+     * @param \Modules\Checkout\Services\OrderService $orderService
+     * @return \Illuminate\Http\Response
+     */
+    public function store(StoreOrderRequest $request, CustomerService $customerService, OrderService $orderService)
+    {
+        if (auth()->guest() && $request->create_an_account) {
+            $customerService->register($request)->login();
+        }
+
+        $order = $orderService->create($request);
+
+        $gateway = Gateway::get($request->payment_method);
+
+        try {
+            $response = $gateway->purchase($order, $request);
+        } catch (Exception $e) {
+            $orderService->delete($order);
+
+            return response()->json([
+                'message' => $e->getMessage(),
+            ], 403);
+        }
+
+        return response()->json($response);
+    }
+}