... I run a 3rd party fraud detection system that works *very* well & I'll offer it to most people on DP for free (as long as you don't have a huge amount of transactions per month). There is minimal amount of development to integrate it & effectively solves most CC fraud problems. You don't have to change credit card processors to use it. PM me with your details (# of transactions/month, what sort of fraud rates you have, type of site) & I'll give you more info on how to set it up.
Ys, I'll PM the link & info. I'd rather not post the link, as I have people paying for th eservice now & would rather not post the name publicly for obvious reasons