Created a new Lumen project Lumen ApiGateway and made basic changes

LumenApiGateway/.env.example

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+APP_NAME=Lumen
+APP_ENV=local
+APP_KEY=
+APP_DEBUG=true
+APP_URL=http://localhost
+APP_TIMEZONE=UTC
+
+LOG_CHANNEL=stack
+LOG_SLACK_WEBHOOK_URL=
+
+DB_CONNECTION=mysql
+DB_HOST=127.0.0.1
+DB_PORT=3306
+DB_DATABASE=homestead
+DB_USERNAME=homestead
+DB_PASSWORD=secret
+
+CACHE_DRIVER=file
+QUEUE_CONNECTION=sync

LumenApiGateway/.gitignore

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+/vendor
+/.idea
+Homestead.json
+Homestead.yaml
+.env
+database/database.sqlite

LumenApiGateway/app/Console/Kernel.php

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+<?php
+
+namespace App\Console;
+
+use Illuminate\Console\Scheduling\Schedule;
+use Laravel\Lumen\Console\Kernel as ConsoleKernel;
+
+class Kernel extends ConsoleKernel
+{
+    /**
+     * The Artisan commands provided by your application.
+     *
+     * @var array
+     */
+    protected $commands = [
+        //
+    ];
+
+    /**
+     * Define the application's command schedule.
+     *
+     * @param  \Illuminate\Console\Scheduling\Schedule  $schedule
+     * @return void
+     */
+    protected function schedule(Schedule $schedule)
+    {
+        //
+    }
+}

LumenApiGateway/app/Events/Event.php

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+<?php
+
+namespace App\Events;
+
+use Illuminate\Queue\SerializesModels;
+
+abstract class Event
+{
+    use SerializesModels;
+}

LumenApiGateway/app/Events/ExampleEvent.php

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+<?php
+
+namespace App\Events;
+
+class ExampleEvent extends Event
+{
+    /**
+     * Create a new event instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+}

LumenApiGateway/app/Exceptions/Handler.php

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+<?php
+
+namespace App\Exceptions;
+
+use Exception;
+use Illuminate\Validation\ValidationException;
+use Illuminate\Auth\Access\AuthorizationException;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
+use Laravel\Lumen\Exceptions\Handler as ExceptionHandler;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+class Handler extends ExceptionHandler
+{
+    /**
+     * A list of the exception types that should not be reported.
+     *
+     * @var array
+     */
+    protected $dontReport = [
+        AuthorizationException::class,
+        HttpException::class,
+        ModelNotFoundException::class,
+        ValidationException::class,
+    ];
+
+    /**
+     * Report or log an exception.
+     *
+     * This is a great spot to send exceptions to Sentry, Bugsnag, etc.
+     *
+     * @param  \Exception  $exception
+     * @return void
+     */
+    public function report(Exception $exception)
+    {
+        parent::report($exception);
+    }
+
+    /**
+     * Render an exception into an HTTP response.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Exception  $exception
+     * @return \Illuminate\Http\Response
+     */
+    public function render($request, Exception $exception)
+    {
+        return parent::render($request, $exception);
+    }
+}

LumenApiGateway/app/Http/Controllers/Controller.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use Laravel\Lumen\Routing\Controller as BaseController;
+
+class Controller extends BaseController
+{
+    //
+}

LumenApiGateway/app/Http/Controllers/ExampleController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+class ExampleController extends Controller
+{
+    /**
+     * Create a new controller instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    //
+}

LumenApiGateway/app/Http/Middleware/Authenticate.php

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+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Contracts\Auth\Factory as Auth;
+
+class Authenticate
+{
+    /**
+     * The authentication guard factory instance.
+     *
+     * @var \Illuminate\Contracts\Auth\Factory
+     */
+    protected $auth;
+
+    /**
+     * Create a new middleware instance.
+     *
+     * @param  \Illuminate\Contracts\Auth\Factory  $auth
+     * @return void
+     */
+    public function __construct(Auth $auth)
+    {
+        $this->auth = $auth;
+    }
+
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @param  string|null  $guard
+     * @return mixed
+     */
+    public function handle($request, Closure $next, $guard = null)
+    {
+        if ($this->auth->guard($guard)->guest()) {
+            return response('Unauthorized.', 401);
+        }
+
+        return $next($request);
+    }
+}

LumenApiGateway/app/Http/Middleware/ExampleMiddleware.php

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+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class ExampleMiddleware
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+        return $next($request);
+    }
+}

LumenApiGateway/app/Jobs/ExampleJob.php

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+<?php
+
+namespace App\Jobs;
+
+class ExampleJob extends Job
+{
+    /**
+     * Create a new job instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Execute the job.
+     *
+     * @return void
+     */
+    public function handle()
+    {
+        //
+    }
+}

LumenApiGateway/app/Jobs/Job.php

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+<?php
+
+namespace App\Jobs;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+
+abstract class Job implements ShouldQueue
+{
+    /*
+    |--------------------------------------------------------------------------
+    | Queueable Jobs
+    |--------------------------------------------------------------------------
+    |
+    | This job base class provides a central location to place any logic that
+    | is shared across all of your jobs. The trait included with the class
+    | provides access to the "queueOn" and "delay" queue helper methods.
+    |
+    */
+
+    use InteractsWithQueue, Queueable, SerializesModels;
+}

LumenApiGateway/app/Listeners/ExampleListener.php

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+<?php
+
+namespace App\Listeners;
+
+use App\Events\ExampleEvent;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+
+class ExampleListener
+{
+    /**
+     * Create the event listener.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Handle the event.
+     *
+     * @param  ExampleEvent  $event
+     * @return void
+     */
+    public function handle(ExampleEvent $event)
+    {
+        //
+    }
+}

LumenApiGateway/app/Providers/AppServiceProvider.php

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+<?php
+
+namespace App\Providers;
+
+use Illuminate\Support\ServiceProvider;
+
+class AppServiceProvider extends ServiceProvider
+{
+    /**
+     * Register any application services.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        //
+    }
+}

LumenApiGateway/app/Providers/AuthServiceProvider.php

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+<?php
+
+namespace App\Providers;
+
+use App\User;
+use Illuminate\Support\Facades\Gate;
+use Illuminate\Support\ServiceProvider;
+
+class AuthServiceProvider extends ServiceProvider
+{
+    /**
+     * Register any application services.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        //
+    }
+
+    /**
+     * Boot the authentication services for the application.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        // Here you may define how you wish users to be authenticated for your Lumen
+        // application. The callback which receives the incoming request instance
+        // should return either a User instance or null. You're free to obtain
+        // the User instance via an API token or any other method necessary.
+
+        $this->app['auth']->viaRequest('api', function ($request) {
+            if ($request->input('api_token')) {
+                return User::where('api_token', $request->input('api_token'))->first();
+            }
+        });
+    }
+}

LumenApiGateway/app/Providers/EventServiceProvider.php

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+<?php
+
+namespace App\Providers;
+
+use Laravel\Lumen\Providers\EventServiceProvider as ServiceProvider;
+
+class EventServiceProvider extends ServiceProvider
+{
+    /**
+     * The event listener mappings for the application.
+     *
+     * @var array
+     */
+    protected $listen = [
+        'App\Events\ExampleEvent' => [
+            'App\Listeners\ExampleListener',
+        ],
+    ];
+}