Just FYI, I purchased this module a while back. It works pretty well excel for some random alert with message "error" during checkout that I'll have to fix in order not to scare away every other customer. Long story short, the author doesn't reply to messages requesting support and he deletes all comments from extension page that might give an idea of "got your money and I'm gone". Pretty absurd, OC admins should really disallow this kind of behavior. It allows false advertising with no consequences.
This is the extension page: http://www.opencart.com/index.php?route ... _id=246960
Think twice before purchasing from this developer. Even though the extension is mighty useful, you get no support and the source code itself is very sloppy.