Advance sales online, the remaining tickets at the POS by the entrance. The remaining places update from both, so a seat that has already been sold online is not sold at the door.
Tickets are checked with a phone
Johku Reader reads the QR code on the mobile ticket and marks the ticket as used, so the same ticket cannot be used twice. An ordinary smartphone is enough as a reader, and for a dark hall you can get a separate code scanner.
A group can arrive at different times
When one code covers several people, you check in only those who are there. You check in those who arrive later with the same code.
Bookings are collected at the door
A ticket booking can be paid for and collected at the POS, so people who booked in advance are served at the same POS as everyone else.