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Re:McDonald's customers unable to order after systems outage by freefaler on Friday March 15, 2024 @08:03AM (#39714596)
Not invoices, just cash transactions need receipts.

The receipts are issued by machines that can sync with the government services frequently, but it's not synchronous. All transactions are written in a special "flash" memory and synced via the included data sim card each 5-10 minutes.

Buffering up to 24 hours is possible.

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