Seems like the problem isn't your delivery, it's the very nature of what you're selling, which he thinks is probably carded or otherwise stolen goods
Indeed. I strongly believe OP is selling stolen goods because of the extreme low price and the fact he seems to have a lot of codes or even an unlimited quantity. OP can you explain how you get the codes? If I'm convinced the codes are not stolen then I'll remove the feedback. Even if the buyers haven't got any problems until now it doesn't mean the codes are legally obtained.
I doubt the coupons are stolen, if they were they wouldn't be valid. AFAIK you can't even buy them, they're just given out at events.
In fact I've bought, sold, been given and given out event coupons several times. (Most recently I was given a decent amount of Digital Ocean gift codes which I had no use for, so I sold them to someone who did). I'm not going to pretend it's allowed by the terms of service, but I don't think it makes me untrustworthy or a money launderer...
If that's the case with OP then I'll remove the negative. I'd need him to prove that's what happening.
do not take advantage of your trust to destroy others.
I don't. I just want to help stopping illegal market here.
laundering money only for 20usd what its meaning.
I'm not sure I understand this. Are you recognizing you're laundering money but you think $20 is too little to get negative trust?
RHavar, regarding the positive trust you left to OP:
Sold me a whole set of legitimate coupons, he sent first and I paid for the ones that worked
Could you post more details about how many codes worked and how many didn't? Did OP say why some codes didn't work?