A similar thing as what you propose already exists in the Nordics. You pay with your card as normal, and the receipt gets logged automatically in the app. http

A similar thing as what you propose already exists in the Nordics. You pay with your card as normal, and the receipt gets logged automatically in the app. https://en.storebox.com/#/ https://en.storebox.com/#/ Not universally supported unfortunately, but the major stores support it.