Is there a unified solution for push notifications on both iOS and Android?

I’m adding push notifications to my app. After googling online there seems to be a Unity package for mobile notifications here. It support local notifications for Android and local/remote notifications for iOS. But it doesn’t support remote notifications for Android.

Are there any plans to add remote push notifications for Android (through firebase, GCM, etc.) in that package?

I recommend checking out OneSignal. I’m one of the founders and we started as a Unity game studio before deciding to switch to building a cross-platform push notification & in-app messaging service. As such, we’ve always had a focus on providing a good service to game developers, and a very high-quality Unity SDK.