It may happen that your plate is not recognised at the entrance (dirty plate, snow, faulty camera,...) and that you have to take a ticket at the entrance.
Don't worry, you won't have to pay twice: all our partners have been trained to deal with this specific case.
At the exit, press the button on the intercom and say that you are an Indigo Neo customer. The employee will let you out without charging you again after checking your reservation.