If you are coming on here and going like hey, $20 for overwatch. That's pretty cheap! Well, you are wrong.
99% of these sellers are scammers. And here's how they do it.
You hit them up on skype and be like oh I want an account. You give them money they give you account info. At first, the account seems alright. It says it has overwatch, you can change email and password and you can even get online and play. Sounds like a steal, no?
But here's how they hit you. Hours later after the transaction with them and you are happily playing your overwatch. You try to log on again and you are hit with the message. "No Overwatch License" [Purchase] [Cancel]. Now you are all suddenly confused and you log on battle.net at the tab where it used to say Overwatch but now says "Pre-purchase Overwatch Now!" Then you get this email, .
And it hits you, you just got scammed. They somehow refunded or cancelled their payment of the game hours after you paid them thinking it was a good deal. Now you are stuck here, with no game and no $20.
tl;dr This **** is too cheap to be legit *****. Take it from someone who already been scammed by two different people on this site.
EDIT: Oh, did I mention how they claim to be working on your account but their skype status stay Away and you never hear from them again. Don't be dumb like me and just buy a legit copy.