I have never seen anyone refused a carte orange at the pay wicket. And in many stations now, you have to use a machine to get a carte orange. But. . . you are supposed to fill out the address form on the back of the picture card, and you are supposed to write the number from the lower right corner of that card on the actually carte orange ticket, although most people don't. I have seen Controle insist that you do so, although not recently.