Improve registration in service provider

src/FacebookPosterServiceProvider.php

@@ -2,31 +2,24 @@
 
 namespace NotificationChannels\FacebookPoster;
 
+use Facebook\Facebook;
 use Illuminate\Support\ServiceProvider;
 
 class FacebookPosterServiceProvider extends ServiceProvider
 {
     /**
-     * Bootstrap the application services.
+     * Register any package services.
      */
-    public function boot()
+    public function register()
     {
-        // Bootstrap code here.
         $this->app->when(FacebookPosterChannel::class)
-            ->needs(\Facebook\Facebook::class)
-            ->give(function () {
-                return new \Facebook\Facebook([
-                    'app_id' => config('services.facebook_poster.app_id'),
-                    'app_secret' => config('services.facebook_poster.app_secret'),
-                    'default_access_token' => config('services.facebook_poster.access_token'),
+            ->needs(Facebook::class)
+            ->give(function ($app) {
+                return new Facebook([
+                    'app_id' => $app['config']['services.facebook_poster.app_id'],
+                    'app_secret' => $app['config']['services.facebook_poster.app_secret'],
+                    'default_access_token' => $app['config']['services.facebook_poster.access_token'],
                 ]);
             });
     }
-
-    /**
-     * Register any package services.
-     */
-    public function register()
-    {
-    }
 }