A dataset with one row per client. Column names are matched loosely (capitalisation, spaces, dashes and accents do not matter): vat, vat_number, vat_nr, btw, btw_nummer, btw_nr, tva, numero_tva, ust_id, ust_idnr, enterprise_number, ondernemingsnummer, kbo, bce, company_number, siren or siret for the number (siren/siret are read as French and ust_id as German when the number has no prefix); name, company, naam or nom; postal_code, postcode, zip, code_postal or plz; reference, ref, client_id or klantnummer; optionally country / land / pays and peppol_id / peppol (a Peppol ID like 0208:0403170701). Up to 5,000 rows are read; at most 2,000 clients are processed per run.