XRechnung API

Overview

The Invocore API turns simple JSON into fully compliant e-invoices. You send the invoice data, we generate valid XRechnung XML (UBL 2.1 or UN/CEFACT CII) or a ZUGFeRD hybrid PDF, validate it against EN 16931, and can deliver it over Peppol.

• JSON in, XRechnung XML / ZUGFeRD PDF / FatturaPA / EDIFACT out
• Validation against EN 16931 including national profiles (XRechnung CIUS)
• Peppol network delivery and DATEV export included
• Webhooks for invoice.created / sent / paid / overdue (HMAC-SHA256)

Authentication

Every endpoint is protected by a Bearer token (JWT). Generate the token in your account settings and pass it in the Authorization header.

Core endpoints

1. Create an invoice

curl -X POST https://api.invocore.eu/api/v1/invoices \
  -H "Authorization: Bearer $INVOCORE_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "currency": "EUR",
    "issue_date": "2026-06-05",
    "due_date": "2026-07-05",
    "buyer": {
      "name": "Mustermann GmbH",
      "vat_id": "DE123456789",
      "email": "rechnung@mustermann.de"
    },
    "lines": [
      { "description": "Beratung", "quantity": 10, "unit_price": "120.00", "vat_rate": 19 }
    ]
  }'

2. Fetch the XRechnung XML

# XRechnung-XML (UBL 2.1) der erstellten Rechnung abrufen
curl https://api.invocore.eu/api/v1/invoices/$INVOICE_ID/xml \
  -H "Authorization: Bearer $INVOCORE_TOKEN" \
  -o xrechnung.xml

3. Validate (EN 16931)

# Gegen EN 16931 / XRechnung CIUS validieren
curl -X POST https://api.invocore.eu/api/v1/invoices/$INVOICE_ID/validate \
  -H "Authorization: Bearer $INVOCORE_TOKEN"
# → { "valid": true, "errors": [], "warnings": [] }

Official SDKs

Instead of raw HTTP calls you can use the typed SDKs:

pip install invocore-sdk

npm install @invocore/sdk

Frequently asked questions