first upload all files

Modules/Cart/Http/Controllers/CartItemController.php

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+<?php
+
+namespace Modules\Cart\Http\Controllers;
+
+use Modules\Cart\Facades\Cart;
+use Illuminate\Pipeline\Pipeline;
+use Illuminate\Routing\Controller;
+use Modules\Coupon\Checkers\MaximumSpend;
+use Modules\Coupon\Checkers\MinimumSpend;
+use Modules\Cart\Http\Requests\StoreCartItemRequest;
+use Modules\Coupon\Exceptions\MaximumSpendException;
+use Modules\Coupon\Exceptions\MinimumSpendException;
+use Modules\Cart\Http\Middleware\CheckProductIsInStock;
+
+class CartItemController extends Controller
+{
+    private $checkers = [
+        MinimumSpend::class,
+        MaximumSpend::class,
+    ];
+
+    /**
+     * Create a new controller instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        $this->middleware(CheckProductIsInStock::class)->only(['store', 'update']);
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param \Modules\Cart\Http\Requests\StoreCartItemRequest $request
+     * @return \Illuminate\Http\Response
+     */
+    public function store(StoreCartItemRequest $request)
+    {
+        Cart::store($request->product_id, $request->qty, $request->options ?? []);
+
+        return Cart::instance();
+    }
+
+    /**
+     * Update the specified resource in storage.
+     *
+     * @param mixed $cartItemId
+     * @return \Illuminate\Http\Response
+     */
+    public function update($cartItemId)
+    {
+        Cart::updateQuantity($cartItemId, request('qty'));
+
+        try {
+            resolve(Pipeline::class)
+                ->send(Cart::coupon())
+                ->through($this->checkers)
+                ->thenReturn();
+        } catch (MinimumSpendException | MaximumSpendException $e) {
+            Cart::removeCoupon();
+        }
+
+        return Cart::instance();
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     *
+     * @param string $cartItemId
+     * @return \Illuminhtate\Http\Response
+     */
+    public function destroy($cartItemId)
+    {
+        Cart::remove($cartItemId);
+
+        return Cart::instance();
+    }
+}