Official comment
One of our QA Ninjas, Anthony, wrote some instructions on how to do this. You can accomplish this using a little elbow grease and the script that he wrote.
- Create Smart Form set to pass CGI variables, with secure TY page
- Create Order Form to place on secure TY page. Generate the HTML embed code and place Order Form on Landing Page using an HTML Layer
- Follow the instructions below to place a script that takes care of the pre filing: