The control center for your e-invoicing in Europe

E4E - Engine for E-Invoicing
The control center for your e-invoicing in Europe
With the Engine for E-Invoicing (E4E), you can manage your electronic invoicing processes centrally, efficiently and legally compliant - across national borders. The cloud-based SaaS/PaaS solution automatically converts your outgoing documents - such as invoices or credit notes - into the legally required e-invoice format.
E4E reduces manual effort, ensures compliance with national requirements and creates transparency in complex regulatory landscapes - whether in Germany, Italy, Poland or other European markets.

Central control of all e-invoicing processes
From creation to delivery - E4E bundles the entire invoice flow in a central system. This creates transparency, reduces manual intervention and ensures legally compliant processes.
Legal compliance for Europe - always up to date
Whether ZUGFeRD, XInvoice, Factur-X or KSeFE4E automatically fulfills country-specific requirements - centrally updated and always compliant.
Quick introduction, individual configuration
The solution is ready for operation in a short time and can be flexibly adapted to processes and organizational structures - multi-client capable, scalable and efficient in operation.
Compatible with leading ERP systems
E4E supports your ERP processes - seamlessly integrated into your existing ERP landscape. This allows you to create added value without changing your systems.
One system for the whole of Europe
E4E replaces country-specific individual solutions with a standardized platform. New countries, formats or regulatory requirements can be easily added.
Technically ready for the future
Web service-based, modularly expandable and powerful - E4E is designed for increasing volumes, new standards and long-term process reliability.
Centralized control. Full compliance.

1. document recording - flexible & open format
E4E accepts individual document formats such as XML, JSON or CSV - exactly as they are created in your system. Data is transferred flexibly via REST API, file upload or via established exchange methods such as FTP/SFTP.
This allows a wide variety of ERP systems to be connected securely and efficiently.
2. validation, mapping & transformation - intelligently controlled
The integrated mapping engine ensures rule-based mapping of your content - including validation of legal requirements and optional customer fields.
Individual requirements are taken into account, as are country-specific regulations.


3. target format generation & mandate control - precise & compliant
E4E automatically generates the required e-invoice format - for example XInvoiceZUGFeRD, FatturaPA or KSeF. You define which clients, networks or recipients receive the output - flexibly controllable and multi-client capable.
4. dispatch & feedback - automated & traceable
E4E transmits completed invoices directly to recipients, authorities or networks such as PEPPOL - including feedback to the ERP system. All steps are logged and can be tracked at any time in the monitoring system.


5. archiving & compliance - audit-proof documentation
All versions, error logs and shipment histories are stored centrally. This allows you to meet internal requirements as well as statutory retention obligations - transparently, securely and retrievable at any time.
Country/Region | Format | Type | Remark |
|---|---|---|---|
Germany |
XRechnung, ZUGFeRD |
XML / Hybrid |
B2G / B2B Mandatory formats |
Italy |
FatturaPA |
XML |
national format |
Poland |
FA |
XML |
Real-time transmission |
France |
Factur-X |
Hybrid PDF + XML |
hybrid format |
Austria |
ebInterface |
XML |
national format |
Belgium |
eInvoice Belgium (UBL.BE via Peppol) |
XML |
national format |
Romania |
RO e-Factura |
XML |
national format |
Denmark |
OIOUBL |
XML |
national format |
Spain |
FacturaE |
XML |
national format |
International |
Peppol |
XML |
international format |

Interest in
E4E - Engine for E-Invoicing
Automate your e-invoicing processes with E4E - the central control unit for legally compliant, Europe-wide invoice processing. Control all processes from document capture to archiving efficiently, country-specifically and fully integrated into your ERP system landscape.
Contact us and find out how E4E can make your invoicing processes legally compliant, transparent and future-proof.