Hello,
 
I've created an application using formidable that outputs auto-filled certificates.  Followed the documentation, mostly.  Now I want to constrain the size of the certificate to be about business card size.  Right now the view spans most of a normal 8.5x11 sheet of paper.  I found the 'paper_size' param but I don't know the standard name of a piece of paper that is 'business card size' if that even exists.
 
What's the easiest and most efficient way to achieve what I'm trying to do?