There are two methods by which e-Invoices can be sent. First, the public invoicing portal (PPF) is the National invoicing portal. In B2B transactions taxpayers can issue and transmit invoices through the PPF (Portail public de facturation) to the buyer, any additional platform is not necessary. Second, a partner dematerialization platform (PDP) is a trusted service provider that is required to be registered with the French tax administration. Registration needs to be renewed every three years.
Source: fiscal-requirements.com