Since former post was very succesful with more than 9k views ,I could tell how did it work. Traveling with wife, I used IDFM app so I bought online a navigo week pass,she bought passe navigo decouverte passe charged with navigo week pass (5+31 €) at Saint Denis Université station counter at 10 pm(works until 1am) woman at desk asked for nothing we put picture and signature by ourselves,clerk talked only french and was a bit rude but I talk a good french so no problem. Both options mobile and card worked perfectly at entrance doors,we met controllers several times either on trains and buses,they were kind (of course kinder if you telling bonjour in french and smiling) they never asked to check photo or signature as I read ,it is a very good option since with 31€ you go everywhere