Calls shown via the official C++ SDK (compiled into your UE module). Blueprint projects: same endpoints over FHttpModule/VaRest — see Getting Started.
Client client("YOUR_API_TOKEN");Creates the SDK client. Optional second arg is the private admin token — dedicated-server builds only, never in a shipped client. HTTP goes through cpr/libcurl; on UE you may also use FHttpModule directly.
response.success / response.errorEvery call returns a response object — check success and read error on failure. API errors are returned, not thrown; transport failures surface as exceptions.
// call from a worker thread or async taskSDK calls are blocking HTTP. In UE, run them on AsyncTask/UE::Tasks — never the game thread — and marshal results back for UI.
template / nlohmann::json Player/room data fields are JSON — pass a struct with adl_serializer (see sdks/cpp Game.cpp) or raw nlohmann::json.