[daddys lil all star]

I have an auction that I sold on the bay and the seller wants me to send my email address so he/she can send payment. I asked to check out and send that way. They responded that the room mate is the one who won the auction and doesnt have a paypal account but they do. I said I cant accept any other payment other then paypal and only if it is linked to the buyers account. What Should I do, what if they leave me a neg fb, can I dispute it? Thanks in advance