This makes little sense. Scammers gonna scam...
They can use a credit card and do a chargeback, etc.
Again this is the only important post in this whole thread, all the worthless, "i invoice you, you invoice me, we're a happy family" is all there just to root out the scammer, but as quoted, the scammer is gonna scam.
There is almost literally nothing you can do, and that person will still scam, no big deal, even with paypal. trust me, you can easily get verified paypal accounts. (this is a business, there are legitimate ppl who want paypal accounts but cannot be verified, b/c of country of origin, age, or whatever criteria, but they need paypal to do business and transactions... but of course this can be used for more neferious deeds)
Do you know how fruitless this will turn out? this is no different than the record companies trying to track down idiots who torrent gigs of music, they aren't gonna catch anyone but the dumbest person who is seeding 1,000 albums cuz they just left everything on auto.
the scammers, will get you, that's their job and they're good at it. It's no different than owning a grocery store and having some thugs run in and steal a 6pack of beer, it's the cost of business, it's also the risk you run when you trade physical products on a virtual meeting place across many state lines.
and here, something to think about, you have 45 days to dispute a paypal charge, that means on day 44, when you almost completely forget about what the hell you've traded and you have like 20 transactions on your paypal, this scammer will call his/her CC company and say, hey i don't recognize this charge, it must be fraudulent/i didn't authorize it, etc... CC then charges back to paypal and sends a new CC to the guy/girl.
(at least that would be what i'd do if i were a dirty/no good scammer, you gotta think like one to catch one)