Push notifications in public app

Hello, is there a way to send a push notification to a specific user of a public app?

Since public apps don’t require sign-in, there isn’t a way to identify specific users, so unfortunately not that I know of.


I have thought of a usersettings field with UNIQUEID (UUI), once the user makes any movement within the database it is already identified, and then as long as the UNIQUEID (UUI) remains on a device, the notification is sent.

in my case I have an application with a usersettings with initial value uniqueid(uui) and every time the user interacts with the app I can have that record.