No chargebacks, they charge 15% fee for gp. Also there are many scams that people try to do...
1. In the form when buying gold, you must put a character name to whom the gold is being traded to. So some asshole will put trade the gold to say um (example, Plznate.) But really his ingame name is actually (Plsnate.) So if you took proof for giving the gp to a Plsnate, it wont do anything because on the form he filled out his ingame name was Plznate and not Plsnate. Yeah lame...
2. Orders come really slow, you might get 5-10 a day, especially if your new to PA.
3. I'd recommend videoing/frapsing the convo and trade