Wow, you're way ahead of us!
We're actually planning on releasing a Unity plugin at some point, we're just still trying to get to the point of having our core software solid enough that we can work on it.
So, first off, are you writing your own connector to our server, or are you using our client library? We already have a C# library available via nuget that should take care of all of the JSON serialization and message indexing fox you, though there's like, zero documentation for it right now.
BTW, if you'd like help in real time, send me a PM with an email address and I'd be happy to add you to our slack instance.