I haven't been able to find any proper information about this..
What I need, is a provider/host for
Amazon's SNS, OneSignal, Firebase etc.,
So, I found out, that Firebase wasn't as complicated as I first thought.. So I ended up using that - also it was the easiest to use, when I figured out how it works. So if anyone looking for push notifications for their app, I would recommend Firebase :-) And whats up with the downvotes?.. Please let me know why this question isn't good enough for Stackoverflow..