API Integration for IT Companies and Software Vendors
Connect to Peppol without having to build your own infrastructure.
For companies that want to offer their customers the option to send e-invoices.
What does integration make possible?
Our API integration is designed to enable both development teams and software vendors to easily work with electronic invoices on the Peppol network.
API Connection to the Peppol Network
Sending and Receiving E-Invoices
Full support for two-way communication of electronic documents.
EN 16931 and BIS Billing 3.0
Full compatibility with European standards for e-invoicing.
Faster implementation of functionality
Reduce integration time from months to weeks thanks to a ready-to-use infrastructure.
Applications for ERP Systems
Seamless integration with existing accounting systems.
Accounting and Billing Systems
Expand your software to include e-invoicing via Peppol without needing your own certification.
API Documentation and Testing Availability
Schedule
March 2026
The first 5 API endpoints
Per account
May 2026
Other API endpoints (except Users and Auth)
Support for all documents
Compatible with SAPI SK
June 2026
Voluntary Participation in E-Invoicing in Slovakia
July 2026
Full UI Testing
: Complete Interface
Scope of Testing Through May 2026
- Processing one document at a time
- Simple System Responses
- Document type: invoice, credit memo, self-invoice
- Test with Valid XML BIS3
- Compatible with SAPI SK
Would you like to view the API documentation?
A complete reference of endpoints in Swagger format.
We are 100% SAPI-SK ready!
How do I get access to API testing?
01
Send us an email
At info@postarflowis.sk with information about your company:
- Trade Name
- Tax ID Number
- The name of the user who will be testing on behalf of your company
- Additional contact information, if applicable
02
Signing an NDA
We will send you an NDA (Non-Disclosure Agreement) for your signature right away.
03
You'll gain access
We will send you the following within 1 business day:
- API token
- We will assign a test Peppol ID
- We’ll send you a sample XML file for testing if you aren’t yet generating your own XML
Technical Support
We already offer testing services. Please feel free to contact us for more information.
Are you interested in integrating with your system?
Write to us at info@postarflowis.sk