CIUS-FR — SIRET missing or failing the Luhn check

Since 2026-09-01 every French VAT-registered business must be able to receive structured e-invoices, and the CIUS-FR overlay requires a valid SIRET for both parties.

Blocks a missing or wrong-length SIRET and a SIRET that fails the Luhn check digit.
Applies the La Poste SIREN 356000000 exception instead of flagging a false positive.
For a non-French buyer, requires its VAT identifier and validates the national format.

1 · Target and document

Paste the canonical invoice model (JSON). The gate runs locally in this page — the same deterministic engine the agent tools call.

Destination formatTarget country rule set

Canonical invoice model (JSON)

|invoice.json

CLIENT-SIDE ONLY • ZERO EGRESS

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