having spent a couple years there it is very clear that the main reason paris does everything in their power to keep the rest of the country its "province", economy, culture and quality of life be damned. actively sabotaging french education is an ovious tool to keep the people subservient. the gimp english literacy, cracking down on international media, and have a long history of a paris-centric top-down control over the "french" language.  even things that have an internationalized standard way of doing it (sepa) are only formally implemented. in reality, nobody will accept your iban/bic. what you needs is french-only "rib" which is nothing but a pdf issued by french banks with your iban/bic formatted as the pre-sepa bank account numbers. french banks by the way will also actively sabotage international transactions and are quick to reject both incoming and outgoing financial traffic. every "rib" you wish to send money to needs to be added into your bank account's "address book". the list goes on. they are very isolationist in sneaky ways like this. but ultimately, their entire system is made to keep non-french unable to enter the country, and french unable to escape it. that nation will never prosper unless the rest of france just scorched earth all of paris.
Germany