Instead, what if receipts just include a QR code to a web page giving all kinds of details? customer could save or integrate with their personal financial management service.
My thoughts exactly, this approach helps with the issue of anonymous purchases (i.e. retailers linking payments with email addresses[0]) although presumably retailers will try and make up for it by shoving analytics on the receipt display page, though that can also be disabled with an adblocker.
I really like this idea, a small QR code would save a lot of paper, _and_ avoid the requirement that I give the store my email address for an electronic receipt.