When attempts to scam me have started in a similar way, they ended with the "buyer" sending an email carefully crafted to appear to be from paypal telling me I'd been paid. In reality, no money had been transferred. This was verified by me logging into paypal by going to the site directly by me typing paypal.com and not clicking any links in the "payment" email whatsoever.
I'm not saying you can't still get scammed somehow if you do actually receive funds.