Does MktoForms2 have an onFailure? Is there a way for my codebase to log if a form submit fails

[Steve_Chang]

For MktoForms2, there is an .onSuccess(callback)

but there doesn't seem to be a .onFailure(callback)

I've read through the api many times, I can't seem to figure out a way to find out if the form submit has failed.

Is there a way to do this? How do other people ensure they are aware when a form submission fails?

Thanks