There are many card checkers on the market; it's impossible for me to use each one. After a buyer purchases my card, if they report an valid rate of less than 30% within 30 minutes, I will use 4check or luxcheck to randomly test a certain proportion of the cards for valid rate. If the valid rate is indeed less than 30%, I will proceed with a replacement. All the rules will be provided to the buyer at the beginning. If they do not accept the results of 4check or luxcheck, or any of my other sales rules, please do not make a purchase