A free API for generating invoice PDFs and e-Invoices.

Open Source Java e-Invoicing library, validator and tool (Factur-X/ZUGFeRD, UNCEFACT/CII XRechnung)

Validation artefacts for the European eInvoicing standard EN 16931

Library for reading and creating European-compliant electronic invoices (EN 16931)

Java library for reading and writing UBL 2.0, 2.1, 2.2, 2.3 and 2.4 documents

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C# / .NET / XML library for working with OASIS UBL 2.0/2.1 documents

Quba is a viewer for electronic invoices

A modern object-oriented PHP library to create valid UBL and Peppol BIS files

XSL transformators for web and pdf rendering of German CIUS XRechnung or EN16931-1:2017 [MIRROR OF GitLab]

Validates XML documents with XML Schema and Schematron

eForms is the notification standard for public procurement procedures in the EU. The eForms SDK is a collection of resources providing the foundation for building eForms applications.

Generic business document validation engine

The European Single Procurement Document enables accelerated processing of preliminary evidence in EU public procurement. The ESPD EDM enables applications to integrate with national ESPD service providers.

Java library with shared Peppol components - identifier handling, codelists, SBDH handler, SMP Client, SML Client

A set of preconfigured rules for the phive engine

QNB Finans Firması tarafından temin edilen Gelir İdaresi Başkanlığı E-Fatura, E-Arşiv ve E-Müstahsil Web Servislerinin nasıl kullanılacağına dair bir fikir edinilmesi açısından hazırlanmış bir Windows Form Uygulaması

Converter for EN16931 invoices from CII to UBL

linked of Romanian fiscal authority(MFP-ANAF-GOV-RO)

Administra XMLs basados en UBL y los estándares de la SUNAT respecto a la facturación electrónica.