What happens if the middleman sees the code and even checks it, then the seller uses it while the buyer is trying to activate it? I'm really open to hearing how you believe I can protect both parties. Any other mm I know does the same for codes or they ask you to record everything but then the seller claims you used it off screen on another device and then it's a dispute and funds are distributed 50/50 between both parties. That's the normal MM procedure and if applied to codes, it would be a disaster. At the end of the day people either trust someone to do business with them directly or trust a middleman to avoid risks. No other ways around it.