In his email he goes on to tell of how he has tried repeatedly to get a refund through the affiliate but gets no response and then goes on to claim he will report you and the affiliate if he doesn't get it soon.
He signs his emails with the signature RG and uses a gmail account to notify you.
When I got the email a few days ago I emailed him right back and said please reply back with the Paypal trans IDs and I will be glad to take care of it. Of course he never replies back because he has no such proof.
Anyway just wanted to let you guys know of a possible scam that could be pulled on you.