And probably the only one.
The Banque de France legislates on third-party accounts: operators managing money that does not belong to them and must be returned to the third party concerned.
Any French company managing third-party accounts must either be a bank, or hold a banking licence exemption from the ACPR (Autorité de Contrôle Prudentiel et de Résolution).
The exemption guarantees the security of your funds, plus full transparency and separation between the amounts collected for each event.