Hello - experimenting with the Membership plugin, and have an authorize.net gateway. I know how to purchase an SSL certificate for my site, but don't understand how to implement it for the Membership plugin's particular registration/purchase pages. I understand the communications between the backend and authorize.net AIM are encrypted, but obviously need to encrypt the user-to-server session for PCI compliance. Do you have any guidance on how to do that for the membership plugins particular implementation?
FYI, I am running WPMU 3.31, BP 1.54 and the membership site is a subdomain.