first upload all files

Modules/Shipping/Facades/ShippingMethod.php

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+<?php
+
+namespace Modules\Shipping\Facades;
+
+use Illuminate\Support\Facades\Facade;
+
+/**
+ * @method static \Illuminate\Support\Collection available()
+ * @method static \Illuminate\Support\Collection all()
+ * @method static array names()
+ * @method static object get(string $name)
+ * @method static \Modules\Shipping\ShippingMethodManager register(string $name, callable|object $driver)
+ * @method static int count()
+ * @method static bool isEmpty()
+ * @method static bool isNotEmpty()
+ *
+ * @see \Modules\Shipping\ShippingMethodManager
+ */
+class ShippingMethod extends Facade
+{
+    /**
+     * Get the registered name of the component.
+     *
+     * @return string
+     */
+    protected static function getFacadeAccessor()
+    {
+        return \Modules\Shipping\ShippingMethodManager::class;
+    }
+}

Modules/Shipping/Method.php

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+<?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);
+    }
+}

Modules/Shipping/Providers/ShippingServiceProvider.php

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+<?php
+
+namespace Modules\Shipping\Providers;
+
+use Modules\Shipping\Method;
+use Illuminate\Support\ServiceProvider;
+use Modules\Shipping\Facades\ShippingMethod;
+
+class ShippingServiceProvider extends ServiceProvider
+{
+    /**
+     * Bootstrap the application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        if (! config('app.installed')) {
+            return;
+        }
+
+        $this->registerFreeShipping();
+        $this->registerLocalPickup();
+        $this->registerFlatRate();
+    }
+
+    private function registerFreeShipping()
+    {
+        if (! setting('free_shipping_enabled')) {
+            return;
+        }
+
+        ShippingMethod::register('free_shipping', function () {
+            return new Method('free_shipping', setting('free_shipping_label'), 0);
+        });
+    }
+
+    private function registerLocalPickup()
+    {
+        if (! setting('local_pickup_enabled')) {
+            return;
+        }
+
+        ShippingMethod::register('local_pickup', function () {
+            return new Method('local_pickup', setting('local_pickup_label'), setting('local_pickup_cost'));
+        });
+    }
+
+    private function registerFlatRate()
+    {
+        if (! setting('flat_rate_enabled')) {
+            return;
+        }
+
+        ShippingMethod::register('flat_rate', function () {
+            return new Method('flat_rate', setting('flat_rate_label'), setting('flat_rate_cost'));
+        });
+    }
+}

Modules/Shipping/ShippingMethodManager.php

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+<?php
+
+namespace Modules\Shipping;
+
+use Modules\Support\Manager;
+
+class ShippingMethodManager extends Manager
+{
+    public function available()
+    {
+        return $this->all()->filter->available();
+    }
+}

Modules/Shipping/composer.json

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+{
+    "name": "fleetcart/shipping",
+    "description": "The FleetCart Shipping Module.",
+    "authors": [
+        {
+            "name": "Envay Soft",
+            "email": "envaysoft@gmail.com"
+        }
+    ],
+    "require": {
+        "php": "^8.0.2"
+    },
+    "autoload": {
+        "psr-4": {
+            "Modules\\Shipping\\": ""
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.0.x-dev"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "dev"
+}

Modules/Shipping/module.json

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+{
+    "name": "Shipping",
+    "alias": "shipping",
+    "description": "The FleetCart Shipping Module.",
+    "priority": 100,
+    "providers": [
+        "Modules\\Shipping\\Providers\\ShippingServiceProvider"
+    ]
+}