We would like to implement a chat feature and were looking for different Chat as a service backend. Knowing that our core business is not Chat, we don't want to invest into building our own.
I started looking at:
Layer, Sendbird, Quickblox, Applozic, Layer, Cometchat
1) Anyone can share their experience implementing these services with Xamarin?
2) Do you have another backend to recommend that you have used to implement?