Get notifications from Backendless

I have searched in the forum about push notification with Backendless as backend and Appgyver as fromtend and find nothing if you do not have authentication!

What I want to do is to send reminders at certain times that are in my database in Backendless to all devices that use my app and the user has selected in the app to receive reminders!
“REST API direct integration” is configured and I access my database in Backendless from my app.

Has anyone managed to get notifications from Backendless without registering users in the app?