Push Notifications without Firebase Cloud Messaging

Question

Can one use a 3rd party service to send Push Notifications without relying on Google's Firebase Cloud Messaging (FCM)?

If the Firebase package is not included with the app by default, could creating / using a custom framework have a similar feature set as Firebase? Or is Firebase integrated within the Android Operating System in some way that is external from an app?

Answer 1

So it depends on your requirements. So if you want to just send normal notifications, then I can really recommend the PushBots.

But if you want to create extra features like invisible data payload, you probaly have to use FCM.