First of all google check your buyer sellers skype ID and email address. if both of you dont have reputation then i suggest you to use official middleman:
1.http://www.ownedcore.com/forums/mmo-...ldstar-mm.html
2.http://www.ownedcore.com/forums/mmo-...beta-keys.html
3.if your unsure of the person's legitimacy status you can always ask me. I focus all my trading in Wildstar both active here and another forum so i know whos a legit one and a scammer. it wouldnt hurt if u just take 5 minutes of ur time to talk to me and ill tell u my honest opinion about the buyer/seller.
Read some of the tips:
http://www.ownedcore.com/forums/mmo-...g-scammed.html
http://www.ownedcore.com/forums/mmo-...t-scammed.html
And if all else fails and u still got scammed you can report him here:
General Trade Talk
and follow correct template:
http://www.ownedcore.com/forums/mmo-...ammer-now.html
lastly if the guy wont use middleman = stay away
if guy ask for key/money first and will always make an excuse = stay away
if the guy sells so low than what im currently buying = stay away ( why because if he is willing to go that low price i would have automatically bought it anyways )
Im always online and ready to help u so always ask me for a review.
UPDATE: another site has implemented something that prevents new user from posting an creating new threads so expect all those scammers there to come here so be extra careful now