Implementation of a notification system - what is your approach?

Are you using Laravel?

The goal is to implement a notification system for different models.

The user who receives the notification should get a widget popping up on his browser screen. It:

involves checking roles / permissions.

will be used with different models https://speedtest.vet/

the notification will eventually be put into slack / whatsapp / sms whatever

Will have call to action e.g. a link or so

are there existing implementations that are good? resources? thoughts / approaches?

i got this...