Does Eventbrite for Salesforce support QR codes?

We don't directly support QR codes, there is no API for them.  But to be honest it is not needed.  The reason is you build your events directly in Eventbrite itself.  Part of their offering is the ability to automatically generate a unique QR code for event tickets when your attendees complete their event registration form. All of this is done on the Eventbrite platform.  

On the integration side, the event, order, and attendee records will be synced back to Salesforce when someone uses the QR code.  You probably have this already but here is the link to Eventbrite QR support article -  https://www.eventbrite.com/l/how-to-use-qr-codes-for-events/