The REST and SignalR APIs documented here are more complex than the client SDKs. Consider using the Lobby C++ SDK or Matchmaking C++ SDK instead, unless those SDKs don’t meet your needs.
Connection Handle, it’s ready to subscribe to topics and receive messages.
When subscribing to Lobby or Matchmaking resources, the client will need to
provide the Connection Handle that they received when starting the session.
For more information about starting and managing a session, see the SignalR
Hub overview.
To manage resource subscriptions with the services that publish messages,
see: