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There are several Restaurants, Cafeterias etc. on the Campus. For some of them you need a special card which you can precharge with money. For this, you go to the restaurant in the very last corner of the Campus (the most east point of the campus). When you enter the building, you can go to the right where you can get the card. You need to give them a copy of your signed contract. You can also charge your card there. Be careful, the opening hours are odd: 9:00-10:30 and 11:30-14:00.
The campus card comes with an online service called Izly (www.izly.fr), where you can recharge your card. There is also an app (iOS, Android, and even Windows Phone), that you can use instead of the card.