I have been selling some php scripts recently and never had any problems. paypal is legit and completely verified with a lot of history of selling with 0 disputes. one guy messaged me today saying he found some other seller and that he would buy his and wants a full refund even though I sent him the files and spent ~5 hours helping him, after saying 5 times he got what he paid and showing him from our conversation that I delivered promised he decided to say fuck you and start a dispute. As there is no licensing system and of course no backdoors I cant guarantee that he wont be using it. Should I present skype history to paypal?