I have a problem, i had a event using My Ticket System. All functioned perfect but i had a problem. If i scan a QR Code and validate this QR Code, other people with MyTicket app can unvalidate the ticket and enter another people. I need help with that
im the owner of the website i sell voucher to consumer. they bring the voucher to the place after the validation from their side i will issue payment to the 3rd party. if there is a invalidate button they might double use the voucher on their end.