I can tell you that the mods on this forum might not like you posting all of his supposed information here...they're very big on privacy rights and whatnot, even if the guy is a scammer.
These Certapay people...do they let you request refunds on money you've sent, like PayPal does?
EDIT: Just looked up Certapay...now I know why their name was familiar. In Canada, at least, they facilitate direct email money transfers between Canadian bank accounts. So, since you used their service, I take it that you made a direct deposit into this guy's bank account?!? 😱
Sorry man, but that's not something you should do with strangers...