The QR page provides a unique code for each pre-registrant to enter an event quickly and accurately at check-in. The QR page is created automatically when a new RSVP site is created. You edit this page in the same manner you would an RSVP site, instructions can be found here: Making an RSVP website.
The same code can also be added to an Apple Wallet before the event. You can create this experience under the Passbook option in the PRE-EVENT section of the campaign experience.
This pass displays event information, such as date, time, location, as well as the pre-registrant QR code. The pass is accessible from the Confirmation Email and Reminder Email.