Allow multiple check-ins for a ticket

[cbellone]

A better way to measure attendance

For multi-day events is sometimes useful to know how many people there were in the venue on each day.
This is particularly useful for trade shows, where the total number of visitors is given by the sum of the visitors for each day, regardless of when their badge was actually printed.

Introducing Category Check-in Strategy

For backwards compatibility, an organizer must explicitly set a category to allow multiple check-ins.
We will define a "Check-In Strategy" for each Category, with the following values:

ONCE_PER_EVENT

default, retro-compatible. Attendees can check-in only once, using their ticket

ONCE_PER_DAY

Extends ONCE_PER_EVENT by adding the possibility to validate the access by using the printed badge.
IMPORTANT: additional check-ins can be done only using the printed badge. This ensures that a badge is printed only once

How the process works

• upon first check-in, the check-in station prints the badge of the attendee, which will contain the QR Code with an ID of the ticket
• on the following days, the attendee will show their badges, and they'll be counted as "visitor" for that day
• if an attendee enters the venue more than once in the same day, the operator will receive a warning. We'll log the badge scan anyway, for statistical purposes

---

This modification impacts:

• Alf.io
• Alf.io Scan
• Alf.io-PI

[cbellone]

implemented