Stephan, re: SSL for Payment Form
I had this same issue, and found I could solve it this way:
1 - You first need to activate an SSL certificate for the underlying site (duh)
2 - Once SSL is working on your website, you can change the MENU LINK
that calls the PM Form to use SSL (it's in the Menu Item, Parameters (System),
3 - Open the Parameters (System) disclosure triangle, and select SSL Enabled "on"
reload the home page on the front end, and select the menu link you just modified.
Your Site should now go into SSL mode for that page (and the confirmation pages)