public async Task CancelChildOrder(CancelChildOrderParameter parameter, CancellationToken cancellationToken = default)
 {
     await Post(CancelChildOrderApiPath, parameter, cancellationToken : cancellationToken).ConfigureAwait(false);
 }
 public async Task CancelChildOrder(CancelChildOrderParameter parameter)
 {
     await Post(CancelChildOrderApiPath, parameter);
 }