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api.wsystem.dev

https://api.wsystem.dev/einvoice/validate

Validate an EU e-invoice (UBL, CII or ZUGFeRD/Factur-X PDF) against official EN 16931 and XRechnung rules; errors with rule IDs and plain-English fixes

last updated: Oct 20, 2026 · type: http · x402 v2

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