The documentation for the checkout pretty clearly states that you must have https:// in order to use the production server. Looking over posts It doesn't appear everyone does. Do you need an SSL cert to use this?

I do not have one and attempted the install and it shows up in zencart now to install. But when I try to browse to
http://mydomain.com/bvEgFfwMEj-yArlxDiWMNA I just get a login. It appears in the google setup I need an API Callback URL which it wants to be SSL. I don't know if that has anything to do with my problem or not?