// Unprotected
public async Task <IStartSessionResponse.StartSession> StartSession(string key)
{
var result = await client.SendMutationAsync <IStartSessionResponse>(mutations.START_SESSION(key, _projectID, Guid.NewGuid().ToString("N")));
_sessionID = result.Data.startSession.sessionID;
_deviceID = result.Data.startSession.deviceID;
return(result.Data.startSession);
}