code: protected function setupCallbacks(Client $client, Container $app, array $config)
      {
          if (!isset($config['callbacks']) || $config['callbacks']) {
              $client->registerDefaultCallbacks();
  
              $client->registerCallback(function (Report $report) use ($app) {
                  $tracker = $app->make(Tracker::class);
  
                  if ($context = $tracker->context()) {
                      $report->setContext($context);
                  }
  
                  if ($job = $tracker->get()) {
                      $report->setMetaData(['job' => $job]);
                  }
              });
          }
  
          if (!isset($config['user']) || $config['user']) {
              $client->registerCallback(new CustomUser(function () use ($app) {
                  if ($user = $app->auth->user()) {
                      if (method_exists($user, 'attributesToArray') && is_callable([$user, 'attributesToArray'])) {
                          return $user->attributesToArray();
                      }
  
                      if ($user instanceof GenericUser) {
                          $reflection = new ReflectionClass($user);
                          $property = $reflection->getProperty('attributes');
                          $property->setAccessible(true);
  
                          return $property->getValue($user);
                      }
                  }
              }));
          }
      }
docs: Setup the callbacks.
  
  @param \Bugsnag\Client                           $client
  @param \Illuminate\Contracts\Container\Container $app
  @param array                                     $config
  
  @return void