Article 529-2-1 of the French Code of Criminal Procedure
In the case of a fifth-class offence or where the regulations so provide, the fixed fine is reduced if the offender pays the amount of the reduced fixed fine either to the ticketing officer when the offence is recorded or within fifteen days of the offence being recorded or, if the notice of offence is subsequently sent to the person concerned, within fifteen days of it being sent. In the…