visibility

Lock-screen visibility requested by the payload (_vs). Applied via androidx.core.app.NotificationCompat.Builder.setVisibility.

On Android 8+ the notification channel's android.app.NotificationChannel.lockscreenVisibility is the ceiling: a notification can only be made more hidden than its channel, never more visible. The SDK default channel is android.app.Notification.VISIBILITY_PRIVATE, so Visibility.PUBLIC has no lock-screen effect unless the app routes the message to a android.app.Notification.VISIBILITY_PUBLIC channel through a NotificationManager.NotificationChannelIdProvider.

null means the payload omitted _vs; the builder default (typically PRIVATE) is left as-is.