Coming Q1 2026

The E-Invoicing Engine
for Developers

JSON in, PDF/A-3 out.
EN 16931 compliant. No data stored. Ever.

ZUGFeRD 2.3

Factur-X 1.0

9 Formats

~50ms

GDPR

Get notified when we launch

How It Works

Three steps to EU-compliant e-invoices. No setup, no configuration.

Send JSON

POST your invoice data as simple JSON. Seller, buyer, items, taxes.

POST /v1/generate
{"format": "zugferd"}

We Process

Generate PDF/A-3 with embedded XML. EN 16931 validated.

XML Schema valid

PDF/A-3 compliant

EN 16931 rules

Receive PDF

Base64-encoded PDF in JSON response. Ready to send or store.

"pdf_base64": "JVBERi..."
// ~50ms response

9 EU Standards Supported

One API for all European e-invoicing formats. From Germany to Italy, B2B to B2G.

🇩🇪

Germany

ZUGFeRD 2.3 - B2B standard (PDF + CII XML)

XRechnung 3.0 - B2G mandatory (UBL XML)

XRechnung required for public sector since Nov 2020. ZUGFeRD recommended for B2B.

🇫🇷

France

Factur-X 1.0 - Identical to ZUGFeRD (PDF + CII XML)

Mandatory for B2G. B2B rollout 2024-2026. Submitted via Chorus Pro portal.

🇮🇹

Italy

FatturaPA 1.2 - Mandatory for B2B/B2G (XML only)

Requires SDI submission. Needs codice fiscale + codice destinatario or PEC. Mandatory since Jan 2019.

🇪🇺

EU & International

Peppol BIS 3.0 - Cross-border network

UBL 2.1 - OASIS standard

CII - UN/CEFACT format

Plain PDF - No XML attachment

Peppol used in EU, UK, Australia, Singapore, New Zealand. UBL is EN 16931 foundation.

Smart Format Detection

Set "format": "auto" and we'll choose the right standard based on country codes, buyer type, and required fields. Germany B2G? XRechnung. France B2B? Factur-X. Italy? FatturaPA.

Stateless by Design

Your invoice data never touches our disk. Send JSON, receive PDF.

Type-safe SDKs

Official libraries for TS, Python, Ruby, Kotlin, Java, Swift, Dart, C#.

AI-Ready (MCP)

Native Model Context Protocol. Let Claude or GPT generate invoices.

EN 16931

No Data Storage

Made in Germany

example.js

const invoice = {
  "number": "RE-2026-001",
  "seller": { "name": "Acme GmbH" },
  "items": [{ "description": "Consulting" }]
}

const pdf = await thelawin.generate(invoice)
// ZUGFeRD PDF in ~50ms ✨

thelawin.dev

The E-Invoicing Engine for Developers