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E4E - Engine for E-Invoicing
Your central e-invoicing engine for Europe
A SaaS/PaaS solution that processes documents in your customer-specific format (invoices, credit notes, etc.) and generates legally compliant e-invoice formats for the whole of Europe.
Why a dedicated e-invoicing engine (E4E) is necessary
Many companies operate several ERP systems, which are often unable to generate e-invoices in compliance with the law. The effort required for individual integrations in each country and each service provider is high.
With E4E you get a central engine that:
- Documents (e.g. invoices, credit notes) are exchanged in your desired format (e.g. XML, JSON, flat file, depending on the ERP process).
- E4E maps, transforms and generates country-specific eInvoice formats (PEPPOL, XRechnung, FatturaPA, KSeF, etc.).
- The ERP systems receive the processed documents back as a binary stream or E4E sends them directly to recipients / authorities.
- You avoid numerous individual interfaces and redundancies.
E4E is maintained centrally and continuously adapted to new legal requirements and format changes.
Customers automatically benefit from the latest versions of the respective e-invoicing standards - without having to carry out their own system updates or integration work.
This not only allows you to avoid numerous individual interfaces and redundancies, but also to remain compliant at all times - Europe-wide.
How E4E - Engine for E-Invoicing works
Input layer (document recording)
- Accepts individual document formats (e.g. internal XML structure, JSON, CSV, etc.)
- Input via REST-API, file upload, file exchange or FTP/SFTP
Validation / Mapping / Transformation
- Mapping engine with generic rules and customer-specific adaptations
- Support for customer fields
- Validation logics according to legal requirements
Format generator / Mandate output
- Generation of various targeted eInvoice formats (XRechnung, ZUGFeRD, FatturaPA, KSeF etc.)
- Selection of which clients / networks / providers the output applies to
Shipping / Distribution
- Return to ERP as download, binary stream or callback (webhook)
- Direct dispatch to recipients, public authorities, PEPPOL networks or national systems
- Monitoring, logging, reporting
The E4E engine - your e-invoicing platform at a glance
- Customized input mapping
E4E accepts native document structures with individual fields and enables flexible mapping without major development effort. - Centralized format generation
E4E generates a wide variety of national and European e-invoice formats (mandates) from one input. - Validation & Compliance Engine
Automated check rules (e.g. mandatory fields, coding lists, tax rate logic) for each target country. - Shipping & network integration
Integrated interfaces to PEPPOL, national platforms, web services or mail protocols. - Error handling & monitoring
Detailed logging, error dashboards, retry mechanisms, notifications. - Multi-client capability & scalability
Multi-tenant architecture, elastic scaling, load distribution. - Security & data residency
Encryption, access control, selectable data residency (e.g. in the EU, locally in Germany, etc.). - API-First & extensibility
REST APIs, webhooks, events, modular extension to new formats and requirements. - Self-service mapping / customization
Customers can configure their mapping or fields directly, without the need for in-depth programming.
Who is E4E suitable for?
- Large corporations & multi-ERP landscapes
If you operate several ERP systems and do not have a uniform e-invoicing capability. - Companies with international business relations
If you need to exchange eInvoices in several EU countries or with authorities. - Manufacturing companies with numerous suppliers
If your suppliers cannot transmit eInvoices, but you have to fulfill legal obligations. - Software manufacturers & CSPs (cloud service providers)
If you want to offer eInvoicing as a service to your customers without having to build your own solution for each country. - Authorities & contracting authorities (as recipient)
Receive invoices in legally compliant formats without having to run an engine yourself.
Your advantages with E4E
- Faster ROI & lower implementation costs
No more country-specific individual solutions - one engine is enough. - Legal certainty & legally compliant processes
New legal requirements (e.g. e-invoicing obligations) can be implemented centrally. - Consistent process control
Standardized logging, error handling and service creation across all systems. - Flexibility & future-proofing
New countries, formats or mandates can be added without renewing your ERP systems. - Scalability & performance
Load distribution, high availability, elastic operation - Transparency & control
Monitoring, histories, transmission and reception logs can be viewed live. - Increased efficiency & cost reduction
Less manual intervention, fewer errors, lower operating costs. - Multi-client capability & isolation
Separate environments per customer, per business unit or mandate.
Supported eInvoice formats & countries
Country/Region | Format/Mandate | 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 |
Peppol |
XML |
international format |
Interest in
E4E - Engine for E-Invoice
A SaaS/PaaS solution that processes documents in your customer-specific format (invoices, credit notes, etc.) and generates legally compliant e-invoice formats for the whole of Europe - ideal for large companies with a heterogeneous ERP landscape.
