Do our attendees need an account or an app?

No. Buyers open your event link, pick seats or how many tickets, type a name and email, and pay with a card. Apple Pay and Google Pay show up when their phone supports them.

The confirmation email has an Open your tickets link. That page holds a QR code for each ticket. They show it at the door. No password, no download, and no printing.

From the same page they can add the event to their calendar, send a ticket to someone else, or ask for a refund. If they lose the email, they can get it again at Find my tickets.