LARAVEL Push Notification Client selection issue

The requirements are as follows:
1. The company's hrms need push notification, but for various reasons, can not expose the server to the public network!
2. Preferably free, and eco-friendly (can integrate other microservices later)
3 A multi-platform client

Because the first one, so the public number can not be achieved!

I looked at the Bearychat incoming robot, as if it could only be pushed to the discussion group, unable to push to the individual!
But his other ecology is doing very well, so want to know if there is a similar platform!

Reply content:

The requirements are as follows:
1. The company's hrms need push notification, but for various reasons, can not expose the server to the public network!
2. Preferably free, and eco-friendly (can integrate other microservices later)
3 A multi-platform client

Because the first one, so the public number can not be achieved!

I looked at the Bearychat incoming robot, as if it could only be pushed to the discussion group, unable to push to the individual!
But his other ecology is doing very well, so want to know if there is a similar platform!

