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Partner API for e‑invoicing

Offer your customers a complete invoicing and e-document solution with no compromises to their customer experience.

Looking for an e-invoicing API?

We've got you covered.

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Faster go-to-market

Why spend a lot of resources, time and effort on something that's not your core?

 

You can skip building your own e-invoicing features or Peppol Access Points. Through us you get everything you need for your customers to get started with e-invoicing.

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Developer-friendly API

We want to make this as easy as possible for you.

 

Created with fellow developers in mind, our product has always emphasised simplicity and usability. Our API empowers SaaS companies in the background with a high-quality add-on for e-invoicing and beyond.

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Secure, stable, and scalable

Security is embedded in our DNA.

 

Being trusted with our partners’ and customers’ business-critical traffic, we prioritise security and reliability as the foundation of our service. Our service is designed to grow and scale together with you and your customers:  we handle over 12 million transactions monthly via our Partner API.

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Real people, with real expertise

We have over 20 years of experience in e-invoicing and we'd love to share it with you!

 

With us, you always have our experts helping you navigate the e-invoicing and compliance landscape in confidence and the best-in-market technical support available at your service.

What you get with our API integration

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Accounts receivable

Send invoices regardless of format

Sending invoices has never been this easy. Your customers can send all their invoices through your system and we’ll take care of the rest. Whether it’s electronic, paper, PDF or email, invoices will find their way to the right recipient every time.

  • Cater to global and local invoicing needs through one API
  • Smart and automatic routing: no invoice gets lost on the way
  • Automatic conversion to needed invoicing format
  • Stay compliant: never worry about e-invoice and tax regulations again
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Accounts payable

Receive all invoices electronically

It’s not just about sending invoices. Through our API your customers can receive all their supplier invoices directly into your system in electronic format. Regardless of what invoicing method their supplier’s use, your customers will gain full control over their spend and access all their invoices in one place.

  • All supplier invoices in one system
  • No more manual processes: digitise 100% of the invoicing process
  • Paper and PDF invoices delivered straight to your system via scanning
  • Ensure safety with automatic fraud detection

No invoice gets lost

Our network always finds the fastest, cheapest and safest route for each invoice. It goes without saying that e-invoice is always our first choice, but if electronic sending is not possible, invoices can also be delivered through email or mail.

  • Maximise successful delivery rates
  • Decrease payment times and costs
  • Smart routing fills in missing recipient information

Automatic formatting

Our solution converts invoices automatically from one format to another based on the preference of the receiver and their operator. You don’t have to build support for many formats; it is enough if your system can handle one. We take care of the rest.

Detect invoice fraud

Our Detect service performs automatic checks on purchase invoices and their senders. These checks help your customers avoid unnecessary risks, such as fraudulent invoices ending up in payment.

  • Automated checks on suppliers and purchase invoices
  • Smart checks and notifications add safety and automation to invoice handling
  • Easily integrated as part of the invoice receiving flow

Features in brief

Can't see what you are looking for? Contact us and let's discuss what we can do.

Invoice sending

  • B2B e-invoicing
  • B2G e-invoicing
  • G2B e-invoicing
  • B2C e-invoicing (solution varies per country)
  • Peppol invoicing
  • Paper invoices
  • PDF invoices
  • Color print invoices
  • Automatic invoice routing
  • Recipient look up

Invoice receiving

  • B2B e-invoicing
  • B2G e-invoicing
  • G2B e-invoicing
  • Peppol invoicing
  • Scanning and interpretation of PDF invoices
  • Scanning and interpretation of paper invoices
  • Automatic format conversions
  • Automated supplier checks
  • Fraud detection

Peppol

  • Peppol invoice sending
  • Peppol invoice receiving
  • Electronic order documents and order responses
  • Electronic catalogues and catalogue responses
  • Electronic despatch advices
  • Invoice responses
  • Automatic format conversions
  • Automated supplier checks

Supported formats

  • Peppol BIS
  • Finvoice
  • Svefaktura
  • EHF
  • UBL 2.0
  • XRechnung
  • KSeF
  • OIOXML
  • TEAPPSXML
  • SI-UBL

Accounts receivable automation

Available in selected countries

 

  • Automated accounts receivable (AR) management
  • Automated accounts receivable (AR) reminders

Additional benefits

  • ViDA compliance
  • API validator tool
  • Free technical integration support
  • Free end-user onboarding
  • Free training and support
  • Dedicated partner management
  • Revenue share & pricing assistance

Built with platforms like yours in mind

Our e-invoicing API offering is tailored to integrate effortlessly with SaaS products that serve businesses across Europe. We’re a perfect fit for:

ERP systems

Add compliant e-invoicing to your all-in-one business suite.

CRM software

Let your users send invoices straight from their sales tools.

Financial Management software

Help users manage cash flow with smarter, modern e-invoicing.

Accounting software

Automate invoice workflows to reduce manual work.

E-commerce platforms

Enable sellers to invoice customers electronically at checkout.

Warehouse Management System (WMS)

Trigger invoicing from shipping or stock events.

Invoicing software

Modernise your software with reliable, compliant invoice delivery.

Point-of-sale systems (POS)

Provide real-time invoicing at the point of sale.

Vertical solutions

Add e-invoicing to industry-specific platforms with ease.

Are you ready to try it out? Start with a free test account

And if you are curious how long this takes: our current record from start to finish is less than two days.

1

Create a free test account

Get started by opening a test account to gain access to our API keys. Our integration support team will guide you through the initial setup, ensuring that the rest of the process will be smooth sailing.

2

Build and test

You’re now ready to begin building the integration. Our integration guide lays out detailed instructions on how to build all the different features our services offers, making it simple for you to get everything up and running.

3

Ready for production

After thorough building and testing, the next step is moving onto the production environment – we’re getting closer to launching your live operations.

4

Monitoring & improvement

Everything in place in production? Great! As the last step we’ll make sure everything works flawlessly. Our support team we’ll be there for you to support further improvements and updates.

Someone has to track every mandate in Europe. Let it be us.

Formats, schemas and validation rules shift by country and by year. We track every change so you don't have to.

Germany

B2B e-invoicing requirements are phasing in, with support for XRechnung and ZUGFeRD.

Poland

KSeF, mandatory e-invoicing, is already live for large businesses, extending further through 2026.

France

All businesses must be able to receive e-invoices from September 2026, and large and medium-sized businesses must also issue them from that date.

Benelux

Belgium's B2B mandate has been in effect since January 2026. Luxembourg has approved a similar law, phasing in from 2028. The Netherlands remains voluntary for now, with a domestic mandate signalled for 2030.

The Nordics

Finvoice and TEAPPSXML in Finland, Svefaktura and Peppol BIS in Sweden, EHF in Norway, and OIOUBL in Denmark, all supported from day one.

Peppol network

A Peppol access point since 2012, connecting your customers to the international network for invoices and other business documents.

Pricing for Nordic direct customers

You can find our up-to-date pricing charts for direct integrators here.

Finland

Valid from 1.1.2026

Sweden

Valid from 1.1.2026

Norway

Valid from 1.1.2026

Questions we hear from partners

Contact us

It depends on complexity. Some integrations are ready in a single working session, others run as a short project. Either way, you can start exploring in the free test environment immediately, before any of that timeline begins.

Yes. Open API documentation and a free test account are available. You can test with real invoice data first and decide afterwards.

No, not unless you want them to. It's built to sit inside your product, your customers see your brand, not a third party they've been handed off to.

One connection covers Peppol, many of the local networks, and interconnection with other providers, so a new country doesn't mean a new API.

No. The same infrastructure that validates a compliant invoice also screens incoming ones against warning lists before they reach your customer's inbox. See Detect for the full capability.

Free integration support throughout the build, not just before the sale.

Pricing depends on your setup and volume, so this is best discussed directly with our team.

Contact sales to discuss your e-invoicing

Every business has different needs. Tell us a little about yours, and we’ll help you find out whether this solution is right for you. No pressure and no obligation, just clear answers from someone who understands your challenges.

Fill in the form, and an Inexchange specialist will get in touch.