Connect
your software to
Peppol in days, not months

Flowin’s API makes e-invoicing simple with Peppol connectivity — all handled for you.

Trusted by +300 software companies

Empower Your Software With a Secure E-Invoicing API

Mandatory e-invoicing isn’t just a regulatory checkbox, it’s your opportunity to enhance customer satisfaction.

Skip the hassle of developing and maintaining your own Peppol Access Point

Flowin offers a fast and cost-effective integration for your software

Everything handled, seamlessly 

Flowin takes care of validation, delivery, and legal compliance—so you can focus on your business, not on changing regulations.

Safe testing, strong security 

Play around with our free test environment. Flowin protects your data with SSL/TLS encryption, OAuth authorization, and regular security audits.

Effortless integration 

Plug Peppol directly into your software via a secure, scalable API.

Why do software and ERP developers
rely on our e-invoicing API?  

Instant inbound and outbound document handling

Reach businesses,
governments, and consumers with one API. Send and receive structured invoices with full feedback visibility (MLR & IMR).

Tailor-made fee models 

Flowin’s pricing is not transaction-based, but is based on the number of clients you have.

No need for your own
Access Point 

No need for your own Peppol access point – updates and operation are handled by Wolters Kluwer.

API-based solution 

Quick and easy integration into your software solution (e.g. ERP, CRM, accounting software).

Legal compliance guaranteed 

We ensure compliance with all applicable laws in Germany and the EU.

Open documentation 

Enables fast connection without in-house development – minimizes your lead time

Secure connectivity 

SSL/TLS, OAuth and regular security audits ensure comprehensive security.

International reach

Send and receive invoices at a local and European scale.

Get free advise now

How it works? 

Flowin’s API is built for seamless integration,
enabling fast and secure e-invoicing via Peppol:

1
Create a free account on our marketplace
2
Test your integration in a secure environment 
3
Go live with seamless and scalable invoice delivery

For who?

Online accounting packages 
ERP
systems 
Online payment systems 
CRM and software providers 

If you’re looking for an easy way to integrate
e-invoicing into your system, I recommend Flowin. From initial contact to comprehensive documentation and responsive support, they make integration straightforward and efficient.

Jean-Pierre Cuypers
CEO, Cafca Software

FAQ

  • What is PEPPOL, and how is it related to e-invoicing? +

    PEPPOL is a standardized network for exchanging electronic documents, including e-invoices, predominantly used in Europe. Its use ensures compatibility with a broad network of businesses and compliance with European mandates.

  • What are the key benefits of employing an API for e-invoicing? +

    APIs offer flexibility and automation, facilitating the seamless sending and receiving of invoices directly from your existing software. This not only saves time but also reduces the likelihood of errors compared to manual processes.

  • How does API-based e-invoicing differ from traditional e-invoicing solutions? +

    API-based e-invoicing integrates smoothly into your existing CRM/ERP systems, automating the invoicing process. In contrast, traditional methods may involve manual steps or separate platforms, resulting in less efficiency.

  • How challenging is it to integrate e-invoicing into my current CRM/ERP software through an API? +

    Integrating an API can be straightforward, especially with well-documented REST APIs. However, the level of complexity may vary depending on your current infrastructure and your business’ specific needs.

  • What compliance standards should I consider when implementing e-invoicing? +

    Ensure adherence to regional and industry-specific regulations, including the upcoming B2B e-invoicing mandate and PEPPOL standards. Non-compliance could result in legal issues and financial penalties.

  • How does the cost of API-based solutions compare to other e-invoicing methods? +

    Overall, API-based e-invoicing tends to be more cost-effective due to automation and reduced manual labor. In contrast, traditional methods can incur additional fees and operational costs.

  • What is Flowin’s pricing model? +

    Flowin offers a monthly subscription model with a minimum commitment and fees ranging from 20 to 80 cents per company usage.

Learn more about e-invoicing 

Everything you need to know about
e-invoicing APIs 
Read more
Peppol Access Points: what they are and how to choose the right provider 
Read more

Your software, ERP and CRM solutions can also benefit from a
secure, fast and easy connection to the Peppol network
without hidden costs.

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