Marketpress and PIN gateway 404 error

Hi there,
Just started playing with Marketpress now that there's a nice Australian gateway option (thanks for that!!!).
On the last page of checkout (confirmation) I get a 404 error.
I suspect that PIN requires SSL for both live and test API calls, however the plugin specifically asks you which you would like to use - SSL for live, or no SSL for test.

Is it that simple?

pin.php appears to query https for both live and test...

In which case no one will be able to use PIN in test mode without SSL, contrary to what the marketpress plugin tells us....
Have there been any other calls for support about this? I can't find anything on here yet.