public function notification($notification = null)
    {
        if (is_array($notification)) {
            if ($this->notification && $this->notification instanceof PayloadNotification) {
                $notification = array_merge($this->notification->toArray(), $notification);
            }
            $builder = new PayloadNotificationBuilder();
            $notification = static::populateBuilder($builder, static::NOTIFICATION_MAP, $notification);
        }
        if ($notification instanceof PayloadNotification) {
            $this->notification = $notification;
        } elseif ($notification instanceof PayloadNotificationBuilder) {
            $this->notification = $notification->build();
        } elseif (! is_null($notification)) {
            throw static::makeInvalidArgumentException(
                $notification,
                'notification',
                PayloadNotification::class,
                PayloadNotificationBuilder::class
            );
        }

        return $this;
    }
public function notification($notification = null)
    {
        if (is_array($notification)) {
            if ($this->notification && $this->notification instanceof PayloadNotification) {
                $notification = array_merge($this->notification->toArray(), $notification);
            }
            $builder = new PayloadNotificationBuilder();
            $notification = static::populateBuilder($builder, static::NOTIFICATION_MAP, $notification);
        }
        if ($notification instanceof PayloadNotification) {
            $this->notification = $notification;
        } elseif ($notification instanceof PayloadNotificationBuilder) {
            $this->notification = $notification->build();
        } elseif (! is_null($notification)) {
            throw static::makeInvalidArgumentException(
                $notification,
                'notification',
                PayloadNotification::class,
                PayloadNotificationBuilder::class
            );
        }

        return $this;
    }
public function notification ( $ notification = null ) { if ( is_array ( $ notification ) ) { if ( $ this -> notification && $ this -> notification instanceof PayloadNotification ) { $ notification = array_merge ( $ this -> notification -> toArray ( ) , $ notification ) ; } $ builder = new PayloadNotificationBuilder ( ) ; $ notification = static :: populateBuilder ( $ builder , static :: NOTIFICATION_MAP , $ notification ) ; } if ( $ notification instanceof PayloadNotification ) { $ this -> notification = $ notification ; } elseif ( $ notification instanceof PayloadNotificationBuilder ) { $ this -> notification = $ notification -> build ( ) ; } elseif ( ! is_null ( $ notification ) ) { throw static :: makeInvalidArgumentException ( $ notification , 'notification' , PayloadNotification :: class , PayloadNotificationBuilder :: class ) ; } return $ this ; }
Set Notification.

@param  mixed $notification
@return $this
Set Notification .