Hugendubel, a German bookstore chain, sells thousands of books every day in their retail stores. Unfortunately, customers hardly visit their online stores. Luckily, they've now found a way to attract their customers to their online store, using a medium that reaches every customer – their sales receipt. When purchasing a book, Hugendubel's software recommends relevant reads – just like in an online shop. This recommendation, taken from the open database Google Books, is then printed on the sales receipt, together with a QR code that leads directly to the online shop.