Open this page on both phones. Make one the counter tile, the other the customer.
Nørrebrogade 42
Tap & saml
Få dit stempel + din kvittering.
Set this on the tile phone, then send the link to the second phone so both match.
Phones can't do a real NFC handshake through a browser, so the tap is a screen tap. Save as PDF uses the phone's own print sheet; save as JPG draws a real image file. The email step is staged — nothing leaves the phone.