Arst Avocats provides you with a model authorized travel certificate regulating travel in the context of the fight against the spread of the Covid-19 virus
Latest version: https://www.gouvernement.fr/sites/default/files/contenu/piece-jointe/2020/03/attestation-deplacement-fr-20200324.pdf
Source: https://www.service-public.fr/particuliers/vosdroits/R55781
Derogatory travel certificate generator: https://media.interieur.gouv.fr/deplacement-covid-19/