I recently got a phone that lets me do contactless payments.
It sounds very fancy but it's just about creating a virtual copy of your card in your phone, and using the NFC antenna in the phone to act as your contactless card.
I was quite intrigued as to whether I'd actually use this fancy new technology... and turns out that it is really convenient, and I do use it a lot, all the time.
However, it's not a perfect workflow. You're constantly asked: "Would you like a receipt?". Some places just automatically print it.
It is a sign, I think, of an unfinished job. We got rid of the physicality of money exchanges by replacing cash with card payments, then we got rid of cards themselves (albeit virtually), but still rely on physical paper for a receipt.
We need to go further: receipts need to be transmitted automatically, as part of the transaction.
And what if we had a standard receipt format, that could be processed with standard tools, and so receipts could be processed automatically? No more manually adding expenses!
One can dream...