Hi Salman,
Greetings from ShepHertz!!!!
You can pass the extra data in connectWithUserName(userName, extraData) API, you can pass json object as a String for this. On AppWarpS2 server side you can override handleAddUserRequest at ZoneAdapter level.
You can save the same data in a collection against a user. While other user connected you can share the same.
Let me know if it helps.
Thanks
Vishnu Garg