Check if they have a verified paypal. 1) First you need somebody's email address... ( Let's use [email protected] as an example. ) 2) Go to PayPal, and log in 3) Copy and paste this url: https://www.paypal.com/verified/[email protected] 4) Replace "[email protected]" with the person's email address ( In the example, it'd be https://www.paypal.com/verified/[email protected] ) 5) The resulting page will show whether or not that email is linked to a verified PayPal account. ( It will show [email protected] is NOT Verified in bold, red letters. ) and if you are making a big deal like more than 100 dollars ask the person if you guys can talk on cam instead of of chatting on skype. If he declines (scammers don't want you to see them for oblivious reasons) chances are he is a scammer. He will make dumb excuses like he's laptop doesn't have a camera or even more far fetch excuses. If he does accept to be on cam, record and take pictures.