Pro Sites – 'success' page or redirect upon completion

Is it possible to make the Pro Sites order process go to a “thank you” success page upon completion?

I’m seeing other threads about this, and actually found myself on a network site and when I ordered a website – the order never completed… (it actually sent email and created account) – but the order page just hanged there with a spinning gif saying it was being processed – no “next step”

this is sort of serious issue for a whole long list of reasons – is there a setting or a Hack to make this happen?

I label this a high priority, thanks