Staff check-in now keeps a receipt for that exact check-in. Undo on the same venue day uses that receipt. After a class has already ended, staff confirm before checking someone in. Attendance from a previous venue day still uses the historical correction workflow.

Client notifications stay off unless staff choose Email, SMS or Push. Older apps that ignore the new receipt can still check people in; they cannot invent an Undo handle.

This update applies to the Booking Bible web check-in roster. The Business app companion sends the same receipt when undoing a check-in.