Recharge cards

[inquisitor]

I'm not sure how they do it in Italy, but in German supermarkets you would take those cards from the shelf to the cashier who scans the barcode, keeps that card thereafter and instead gives you a receipt coming out of the slip printer which contains the topup code. Those cards on the shelf are just there to help customers identify the required brand and amount of available topups and to avoid misunderstandings.