I'm in the US and these are in every large grocery store in my area now. Walmart has their app that you can feed in your credit or debit information then scan a QR code on the POS screen to pay. I heard that Sam's club has their app that allows you to scan your goods as you get them, hit pay on the app, then show your receipt on your phone at the door. No lines, no muss, no fuss. I read that Walmart is trialing something similar.

I find them convenient, sure, but sometimes I don't mind talking with someone and letting them do the scanning for a change. lol! Thank you so much for sharing! Upvoted!