Your account is not yet reputed on this forum, why not include escrow if this is not a scam.
So if the person send you money but you scammed the person? I believe this would be about money first or first pay. This is the reason I prefer not to recommend service like this, because I have seen many that led to scam.
But the buyer can go for escrow. There are escrow service providers on this forum:
Few Trusted Escrow Providers