einvoicekit

The product is an API and validator for EN 16931-compliant e-invoicing that computes invoice totals, builds Factur-X PDFs with embedded XML, and validates documents against the official rule set. It is for developers, finance teams, and operations teams in B2B companies that need to generate and check Factur-X, ZUGFeRD, XRechnung, UBL and CII invoices. It is delivered as HTTP endpoints for validation and generation plus a browser-based validator that runs locally.

Key features

• Generate Factur-X PDF from JSON
• Compute invoice totals automatically
• Embed CII XML in PDF/A-3B
• Validate against EN 16931 rules
• Validate XRechnung 3.0.2 CIUS
• Validate Factur-X 1.09
• Validate Peppol BIS 3.0
• XSD and Schematron validation
• Return BT-field referenced errors
• Detect UBL vs CII syntax
• Extract embedded XML from PDF
• Browser-based local validation