There are stores trialling exactly your preferred method. One of my local supermarket chains has portable barcode scanners on a wall. You pick one up, scan your groceries as you collect them, then take the scanner to a self checkout that links to the scanner. At that point you pay for your items and leave.

Fun fact, that’s what’s left after the Victorian fad of eating mummies. Wiki link

I don’t know the history of the photo, but I know some Kopi Luwak ‘producers’ force feed the civets coffee cherries to maximise production. So I can’t say this is a natural shit for a civet, because it could be human induced.