Generate a complete Factur-X hybrid invoice: post simple business JSON (parties, lines, VAT) and get a PDF/A-3B document with the EN 16931 CII XML embedded (plus XMP) - the human-readable PDF that IS the structured e-invoice mandated by the French 2026-2027 reform. Already passed the full official rule set, and its embedded XML re-read byte-for-byte by our own reader; totals computed for you, inconsistent inputs rejected with actionable field-level errors. No account, no key.

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