After the trade is completed, the person who was scammed either doesnt receive what was promised, or the items involved are not what was agreed upon.
A common tactic by scammers is to force you to trade quickly so they can change items/gifts in the trade without you noticing.
Ensure that you are trading with the correct user.
You cannot add a CD Key into the trade window.Can I trade Steam game exchange ps4 console Games?Sign up using Google, sign up using Facebook, sign up using Email and Password.What do you mean by trading Steam Gifts?To create a trade, please do the following: Alternatively, if you are chatting with your friend, you can start a trade from the chat window by clicking on the large arrow and selecting Invite to Trade: Open your Friends list, located in the lower right.After logging in to your account, hover over your profile name in the top-middle of the Steam screen and select Inventory from the drop-down menu.You can initiate a trade with anyone in a Group Chat or on your Friends List.What happens to scammers?Do not trade items outside of the trade window.Mouse over every item to ensure that the item/gift's properties are correct.
Note: Using a Limited User account might prevent you from accessing some Community Market features.
Click on Make Trade - Once you click this button the trade cannot be undone.
If you wish to remove an item, game, or coupon simply drag it back to your inventory from the trade window.