What you are looking for I believe resembles something like a terminal which makes paying in bitcoin becomes as simple as just doing a swipe and then it's done. It's to facilitate retail operation. Read that it's quite popular in Germany right now. You might want to check out the link here about PEY terminals. https://www.cryptocoinsnews.com/free-pey-3d-printed-bitcoin-payment-terminals-spreading-across-germany/