Registration of a Single Manager using a Service Provider

ManagerServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Managers\Transport\TransportManager;
use App\Managers\Transport\TransportContract;

class TransportServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        // This will bind a single instance of our Manager to the Service Container
        $this->app->singleton('transport', function ($app) {
            return new TransportManager($app);
        });
        
        // This singleton allows to retrieve the driver set has default from the manager
        $this->app->singleton('transport.driver', function ($app) {
            return $app['transport']->driver();
        });
        
        // This allows us to get the driver set as default with pointing the Transport Contract
        $this->app->alias('transport.driver', TransportContract::class);
    }
}