VRAppointment-admin/app/Providers/EasySmsServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Overtrue\EasySms\EasySms;

class EasySmsServiceProvider extends ServiceProvider
{
    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {
        //
        $this->app->singleton(EasySms::class, function ($app) {
            return new EasySms(config('easysms'));
        });

        $this->app->alias(EasySms::class, 'easysms');

    }

    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {

    }
}