Our QR Code Email Ticket plugin allows you to generate a QR Code pdf ticket of events/products/services from your website after purchase and sends it as a pdf attachment on the email. You can then Scan & validate QR code. For example if you sold tickets to a party or for a bus ride. You can then scan the qr code (use any free qr code scanner app) to see if its valid or not. Once its scanned it becomes invalid, to avoid the customer trying to use ticket twice).