[jarcoal]

Indeed, I observed this because our local grocer asks for your email address when checking out so it can send receipts there. After providing mine it never asked again.

It would be really cool if it generated new numbers each time and had an amount coded to that number. So when I wave my Apple Pay device over the reader it would display the amount on the device, I would approve, and then a number would be handed back that's only good for that amount.