get https://api-demo.single-invoice.co/v3/lookups/companyIdentifiers
List supported company Id lookup services (e.g., TVADE, SIRET, DUNS, CRO etc..)
This method will provide a current list of company id services and whether or not the service is primary/principal for that country.
For example, France has the principal SIREN number but you can also use DUNS to search for a company.