The API layer between
ERP and compliance.
POST an invoice. Get back structured validation results with rule IDs, field paths, and fix suggestions — for XRechnung, ZUGFeRD, EN16931, and Peppol BIS 3.0. No portal, no manual process.
// Request
curl -X POST https://api.xingen.de/api/v1/invoices/validate \
-H "Authorization: Bearer $API_KEY" \
-F "profile=XRECHNUNG" \
-F "file=@invoice.xml"// Response 422 Unprocessable
{
"valid": false,
"errors": [{
"code": "BR-DE-14",
"severity": "ERROR",
"field": "BuyerReference",
"message": "Missing Leitweg-ID",
"suggestion": "Provide BT-10"
}]
}Built for developers, not compliance departments
A clean REST API that fits into your ERP connector, CI pipeline, or billing system — not a portal you have to log into.
POST XML, get structured JSON back
Send your invoice XML to one endpoint. Get back rule IDs (BR-01, PEPPOL-EN16931-R003), the failing field path, and a fix suggestion — all in machine-readable JSON. Wire it straight into your pipeline or UI.
OpenAPI 3.1 spec + Postman collection
Full spec ships with every endpoint. Import into Postman, generate a typed SDK, or use auto-complete in your IDE. No guessing, no undocumented edge cases.
Every European compliance path, one key
XRechnung 3.0.2, ZUGFeRD 2.x, Factur-X, EN16931 core, Peppol BIS 3.0. Switch profiles with a single query parameter — the same integration covers DE, FR, IT, and cross-border.
Turn any plain PDF invoice into ZUGFeRD
Drop a plain, non-standardized invoice PDF — scanned or digital — into the UI, or POST it to /v1/invoices/extract. Claude AI extracts the fields, validates them, and hands back a ready-to-send ZUGFeRD/Factur-X PDF.
Validated against the official rulesets
No home-grown rule interpretations. Xingen validates against the same Schematron rulesets that the German KoSIT validator and the Peppol network enforce — pinned to the current official releases.
XRechnung 3.0.2
Schematron 2.5.0Full CIUS validation for the German XRechnung standard: every BR-DE business rule from the official KoSIT XRechnung Schematron release 2.5.0 — Leitweg-ID (BT-10), payment details, VAT and Kleinunternehmer rules included.
xrechnung-3.0.2-schematron-2.5.0 Peppol BIS Billing 3.0
OpenPeppol rulesetThe complete OpenPeppol BIS Billing 3.0 Schematron ruleset (PEPPOL-EN16931-R rules) as published in the official peppol-bis-invoice-3 release — for invoices exchanged over the Peppol network.
peppol-bis-invoice-3 KoSIT validator compatible
EN 16931 coreValidation results align with the official KoSIT validator (Prüftool) and its XRechnung validator configuration. The full EN 16931 core rule set (BR, BR-CO, BR-DEC, VAT category rules) runs underneath every profile.
validator-configuration-xrechnung Frequently asked questions
Does Xingen validate against the official KoSIT validator?
Yes. Xingen implements the rules of the official KoSIT validator configuration for XRechnung and cross-checks results against the KoSIT Prüftool, so a green result from the API matches what German public-sector platforms like ZRE and OZG-RE expect.
Which XRechnung Schematron version does Xingen support?
Xingen validates against XRechnung 3.0.2 using the official KoSIT Schematron release 2.5.0 (xrechnung-3.0.2-schematron-2.5.0), including all BR-DE business rules such as BR-DE-14 (buyer reference / Leitweg-ID) and BR-DE-16 (seller VAT identifier).
Is Peppol BIS Billing 3.0 validation supported?
Yes. Xingen runs the complete OpenPeppol peppol-bis-invoice-3 Schematron ruleset, covering the PEPPOL-EN16931-R validation rules required for sending invoices over the Peppol network.
What is the difference between EN 16931 and XRechnung validation?
EN 16931 is the European core invoice standard (BR, BR-CO and BR-DEC rules). XRechnung is the German CIUS on top of it, adding national BR-DE rules like the mandatory Leitweg-ID. Xingen validates both layers in a single API call — select the profile with one parameter.
Can I convert a plain PDF invoice into ZUGFeRD?
Yes. Upload a plain, non-standardized invoice PDF in the dashboard, or POST it to /v1/invoices/extract. Xingen uses Claude AI to extract the invoice fields — including from scanned/image-based PDFs — validates them, and produces a downloadable ZUGFeRD/Factur-X hybrid PDF. Available via both the web UI and the API.