The advertised online shop exists since Sept 2010, now has about 40,000 customers and provides vouchers for inexpensive fueling and shopping. The fixed discount eg 15%, the range includes gas stations, supermarkets, drugstores, Elektronikaufhäuser, etc and is extended again and again. The operator of the online shops are in the Conditions of its website a 100% satisfaction guarantee. Ingeniously simple - simply awesome.