Ensure that _simulate_offline_request() is implemented and returns a response object compatible with the awaited _build_response result; otherwise enabling offline mode may cause runtime errors or missing fields on res.

The identify() method is declared to return TaloPlayer but returns null on failure. Confirm downstream callers handle a null return or adjust the signature/behavior to avoid unexpected null dereferences.

Each setter updates the in-memory ConfigFile but never calls save_config(), so runtime changes won’t persist to disk. Consider auto-saving or documenting that callers must invoke save_config().