first upload all files

Modules/Coupon/Http/Controllers/Admin/CouponController.php

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+<?php
+
+namespace Modules\Coupon\Http\Controllers\Admin;
+
+use Modules\Coupon\Entities\Coupon;
+use Modules\Admin\Traits\HasCrudActions;
+use Modules\Coupon\Http\Requests\SaveCouponRequest;
+
+class CouponController
+{
+    use HasCrudActions;
+
+    /**
+     * Model for the resource.
+     *
+     * @var string
+     */
+    protected $model = Coupon::class;
+
+    /**
+     * Label of the resource.
+     *
+     * @var string
+     */
+    protected $label = 'coupon::coupons.coupon';
+
+    /**
+     * View path of the resource.
+     *
+     * @var string
+     */
+    protected $viewPath = 'coupon::admin.coupons';
+
+    /**
+     * Form requests for the resource.
+     *
+     * @var array|string
+     */
+    protected $validation = SaveCouponRequest::class;
+}

Modules/Coupon/Http/Controllers/CartCouponController.php

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+<?php
+
+namespace Modules\Coupon\Http\Controllers;
+
+use Modules\Cart\Facades\Cart;
+use Illuminate\Pipeline\Pipeline;
+use Modules\Coupon\Entities\Coupon;
+use Modules\Coupon\Checkers\ValidCoupon;
+use Modules\Coupon\Checkers\CouponExists;
+use Modules\Coupon\Checkers\MaximumSpend;
+use Modules\Coupon\Checkers\MinimumSpend;
+use Modules\Coupon\Checkers\AlreadyApplied;
+use Modules\Coupon\Checkers\ExcludedProducts;
+use Modules\Coupon\Checkers\ApplicableProducts;
+use Modules\Coupon\Checkers\ExcludedCategories;
+use Modules\Coupon\Checkers\UsageLimitPerCoupon;
+use Modules\Coupon\Checkers\ApplicableCategories;
+use Modules\Coupon\Checkers\UsageLimitPerCustomer;
+
+class CartCouponController
+{
+    private $checkers = [
+        CouponExists::class,
+        AlreadyApplied::class,
+        ValidCoupon::class,
+        MinimumSpend::class,
+        MaximumSpend::class,
+        ApplicableProducts::class,
+        ExcludedProducts::class,
+        ApplicableCategories::class,
+        ExcludedCategories::class,
+        UsageLimitPerCoupon::class,
+        UsageLimitPerCustomer::class,
+    ];
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param \Illuminate\Http\Request $request
+     * @return \Illuminate\Http\Response
+     */
+    public function store()
+    {
+        $coupon = Coupon::findByCode(request('coupon'));
+
+        resolve(Pipeline::class)
+            ->send($coupon)
+            ->through($this->checkers)
+            ->then(function ($coupon) {
+                Cart::applyCoupon($coupon);
+            });
+
+        return Cart::instance();
+    }
+
+    /**
+     * Destroy resources by given ids.
+     *
+     * @return void
+     */
+    public function destroy()
+    {
+        Cart::removeCoupon();
+
+        return Cart::instance();
+    }
+}