Chances are, after a little searching around, that your requirements extend to answering a questionnaire and registering as a Level 4 merchant.
I read through their site, and FDMS too.
Here's their site:
SecurityMetrics Site Certification - Simplify PCI Merchant Compliance - SecurityMetrics
And then, FDMS provided information on their site as well (linked above). So it looks fairly easy for you to do.
Jsst register, do the questionnaire and you should be all set.
Hope this helps...