first upload all files

Modules/Newsletter/Http/Controllers/SubscriberController.php

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+<?php
+
+namespace Modules\Newsletter\Http\Controllers;
+
+use Newsletter;
+use Modules\Newsletter\Http\Requests\StoreSubscriberRequest;
+
+class SubscriberController
+{
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function store(StoreSubscriberRequest $request)
+    {
+        Newsletter::subscribeOrUpdate($request->email);
+
+        if (! Newsletter::lastActionSucceeded()) {
+            return response()->json([
+                'message' => str_after(Newsletter::getLastError(), '400: '),
+            ], 403);
+        }
+    }
+}

Modules/Newsletter/Http/Requests/StoreSubscriberRequest.php

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+<?php
+
+namespace Modules\Newsletter\Http\Requests;
+
+use Modules\Core\Http\Requests\Request;
+
+class StoreSubscriberRequest extends Request
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'email' => ['required', 'email'],
+        ];
+    }
+}

Modules/Newsletter/Providers/NewsletterServiceProvider.php

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+<?php
+
+namespace Modules\Newsletter\Providers;
+
+use Illuminate\Support\ServiceProvider;
+
+class NewsletterServiceProvider extends ServiceProvider
+{
+    /**
+     * Bootstrap the application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        if (config('app.installed')) {
+            $this->app['config']->set('newsletter.apiKey', setting('mailchimp_api_key'));
+            $this->app['config']->set('newsletter.lists.subscribers.id', setting('mailchimp_list_id'));
+        }
+    }
+}

Modules/Newsletter/Resources/lang/en/attributes.php

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+<?php
+
+return [
+    'email' => 'Email',
+];

Modules/Newsletter/Routes/public.php

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+<?php
+
+use Illuminate\Support\Facades\Route;
+
+Route::post('subscribers', 'SubscriberController@store')->name('subscribers.store');

Modules/Newsletter/composer.json

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+{
+    "name": "fleetcart/newsletter",
+    "description": "The FleetCart Newsletter Module.",
+    "authors": [
+        {
+            "name": "Envay Soft",
+            "email": "envaysoft@gmail.com"
+        }
+    ],
+    "require": {
+        "php": "^8.0.2",
+        "spatie/laravel-newsletter": "^4.8"
+    },
+    "autoload": {
+        "psr-4": {
+            "Modules\\Newsletter\\": ""
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.0.x-dev"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    },
+    "minimum-stability": "dev"
+}

Modules/Newsletter/module.json

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+{
+    "name": "Newsletter",
+    "alias": "newsletter",
+    "description": "The FleetCart Newsletter Module.",
+    "priority": 100,
+    "providers": [
+        "Modules\\Newsletter\\Providers\\NewsletterServiceProvider"
+    ]
+}