It would be beneficial to include the QR codes in the Donor Portal so attendees can access them at any time. Right now, you can only send out one email trigger to the donor after purchase. There is no way for them to regain access if they delete it by mistake unless I resend the email manually. Also, sending an automated 24hr event reminder with QR codes and an event know-before-you-go would help with this, but the email automations are not set up to work that way.