[elephantum]

Russia does that already country-wise.

Every receipt is sent to federal taxes office instantly, every cash register is connected to the internet.

[kzrdude]

One of the big grocery stores in sweden (coop) closed all their shops for a week last year due to a ransomware attack. So yeah, all those cash registers were and are connected to the internet.

[el-salvador]

El Salvador does this too for business to business receipts. It doesn't include item descriptions though, only totals.

[jacooper]

Some Arab gulf countries do this too