What details does a foreign company need to get a French IDU?

Your company name, address and one identifier that depends on where you are resident. ADEME's list: an EU company gives its intra-EU VAT number; a company outside the EU gives an intra-EU VAT number if it has one, or otherwise the registration number issued by the tax authority of its country of residence. You also give the full postal address, phone number, website if any, and the approval categories your membership covers. A French company uses its SIRET instead.ADEME