I added SMF trader system. It works fine but... Anyone can add feedback to whoever they want and how much they want.
This way they can destroy anyones feedback by just putting false details. Is there or is it possible to make that if someone wants to sell someone anything then he must press button " Initate transaction ". After pressing it the seller has new message in his feedback system(profile). He must accept if he has contacted buyer and is fine with his offer. After that they only can give each other feedbacks.
Example: mmoexchange.net
You can see that in every theard after Username there is "Initate transaction".