How does QR code check-in work?

Each confirmed person sees a QR code on their signup page, the one linked from their confirmation email. Set a door PIN on the signup's Check-in and safety card. Staff scan the code with a phone camera, type the PIN once, tap Unlock check-in, then tap Check in. Without a PIN, the code shows Show this at the front desk, and you check people in from the signup page. See Check volunteers in at the door with a PIN.