thank you for your reply, Tyson
the list only works AFTER you notice and identify a suspicious buyer which is AFTER they have bought and cleaned out all your stored PINs. It's not very useful to blacklist someone AFTER they robbed you.
The way it should work is after you receive a payment, the system will check if the buyer have bought from you in the last _ days, and how many times. If they dont go over the set limit, then the system will release and email them the PIN they bought.
It may take some extra work on your end, but w/o the proper security measures in place, we sellers are just sitting ducks.
Lemonbar, I have read your past posts. Thank you for your input and I hope my post will let the staff know your situation is not unique