Yes, Samsung Pay and Samsung Knox can be used in France with this model, provided that the bank card is compatible and the phone is properly configured for the European market.
The SM-S938BZTGEUE is designed for Europe and generally works without problems for these services, even if it is a version intended for other European countries.
Samsung Pay requires a Visa, Mastercard or Maestro card issued by a partner bank.
Samsung Knox is integrated into all recent Galaxy smartphones and ensures the security of transactions and data.
If you have any doubts about the exact compatibility of the EUE model in France, you are advised to check with the Samsung community or official support.