If you are unfortunate enough to deal with the level of scum that would chargeback for an item they received from you.
When the person creates the dispute against you, reply and state that this was for virtual goods. Escalate the dispute to a claim and give all evidence as if you were disputing in a OSBot dispute. Include images, links, pictures of the trade, chat and the OSBot dispute. Be sure you explain what information you are giving to them and mention multiple times that the goods were virtual Call PayPal. Be ready to verify your account via phone and contact a Dispute representative. Again, explain what the charge back was from and allow the support specialist to review your case. Win back your money
Hopefully this helps you. It just worked for me