There’s a Paypal claim time limit. These are not what he’s worried about. Paypal claims are very easy to dismiss and you practically just need to say that whatever you’re selling is a digital good to get off the hook immediately.
Chargebacks are a different story. Chargebacks go through the card’s company and pretty much hammer you with a $20 fine immediately with no chance of debating it. It takes months for a chargeback case to actually be decided and only sometimes will Paypal actually waive the fee (they claim that they do it as a small gratuity but some people have been outright denied).
OP: If you’re worried about chargebacks, don’t worry too much. It doesn’t happen terribly often so long as you aren’t a total dick to everyone. If you do get nailed with one, appeal to Paypal and occasionally they’ll waive the fee(s). It’s just something you kinda have to put up with a few times a year.
[editline]19th July 2015[/editline]
And yeah, if someone goes through the effort of contacting their company, just ban them and tell them to fuck off. Although you might get fined, I’ve actually have had chargeback cases decided in my favor (but never got the $20 waived, thanks paypal).