What information can Google Play Services get when using push notifications?

Questions
1

I am trying to learn how push notifications work.

Please correct any wrong idea.

This is my current understanding:

  1. When I install a messaging app and allow push notifications, a unique token gets generated to identify the app and the device.
  2. When I receive a message, the notification is not sent to my phone directly. Instead, it is sent to a Google server with the added token.
  3. Google server checks the token and then knows where to redirect that notification.
  4. The notification is sent to Google Play Services app running on my phone and I can see the delivered message.

When I look at the notification, I can see the message content. Does it mean that Google servers and Google Play Services can see it too? What kind of data can they get from push notifications?

2

there isn’t really any option for push notifs other than FCM (android) and APN? (ios)

you can do something unifiedpush+ home assistant io but hard to pull.

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