From 2026-09-01 the buyer's SIREN (BT-47) is mandatory on French B2B invoices — it drives routing via the certified platforms (PDP).
Capture the customer's SIREN (publicly searchable in the SIRENE register) and emit it as the buyer's legal organization ID.
The Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
Open the validator← All validation rules
Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).
