InvoiceShelf/app/Providers/BroadcastServiceProvider.php

<?php

namespace InvoiceShelf\Providers;

use Illuminate\Support\Facades\Broadcast;
use Illuminate\Support\ServiceProvider;

class BroadcastServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Broadcast::routes();
        Broadcast::routes(['middleware' => 'api.auth']);
        require base_path('routes/channels.php');
    }
}