Make sure they are Verified
Only accept as Gift
Make sure they are a member of this site for a significant time
If you are scammed out of a significant amount of gold after following these steps then get your account restored immediately by emailing blizzard in customer support and be sure to tell them that you were hacked
Happy Selling don't get scammed like this dumbass = (
10M scammed 330$ reverted sadly but now I know to not make mistakes like this