We are currently struggling with integrating Mixpanel with our React Native App (The main challenges we are facing are with the following features In-App Message, FCM Integration, Group Support Etc.).
Our current implementation is based on a fork of: https://github.com/davodesign84/react-native-mixpanel
Please vote up if you are facing similar problem and would like to align on a common implementation (since MP doesn't offer official SDK for RN and nothing on the Roadmap...)