Only one till to cash up, count float for etc.
Only one member of staff to keep an eye on for honesty
lots of positives for the company.
I'm surprised
@miklcct didn't pipe up here - isn't in the case that at some Asian "food courts" that you go to a till to pay cash and get vouchers or a charged stored-value card, then go and buy your food with that, going back to the till for a refund if you didn't spend it all?
Another similar quirk was that in the 1990s in Kwik Save if you wanted to pay by cheque you had to first go to the customer services desk, where they'd verify your guarantee card was valid, endorse the cheque and mark it as payable to Kwik Save Ltd (or whatever it was) with a rubber stamp, then you'd take it and pay with it at the till. Individual checkout operators weren't allowed to do it.
In that case you ignore the whole of the bit in brackets, and buy on board or at your destination. Or, when it is finally introduced, online.
An interesting question about this new portal is whether use of it will be mandatory, or if it'll be optional like using your phone is for all passengers now.