It keeps selling when the internet stops.

Sales are held on the device and sent the moment the line comes back. Nothing is counted twice.

Scan it, or sell it without a barcode.

One beep sells a crate of twenty-four. Tomatoes and charcoal reach the basket by touch.

At the end of the day, the drawer is counted.

Every difference is recorded with a name against it. That is the number an owner trusts.