In reply to Andrew Craften.

Interestingly enough Visa Europe has indicated in a recent white paper that an iFrame deployment is acceptable for SAQ A. Granted it would be nice if the article stated that SAQ A or SAQ A-EP is for e-Commerce only merchants. But still iFrame does meet SAQ A-EP requirements per Visa Europe.

http://www.visaeurope.com/media/images/processing e-commerce payments guide-73-17337.pdf