Compass KSeF – API Connector

API Connector for companies with in-house IT teams. A ready-to-use REST API specification for integrating with SAP, Oracle, Dynamics and other ERP systems. No GUI, full control.

Compass KSeF API Connector is an integration solution designed for organizations that want to connect their internal IT systems to the National e-Invoicing System (KSeF) without relying on an external user interface. The connector provides REST API documentation enabling the sending of structured invoices to KSeF, downloading official confirmations (UPO), receiving purchase invoices, and managing authorization tokens—all directly from the client’s ERP system.

Who is it for

For companies with their own IT resources or working with ERP integrators, who want to implement KSeF communication on their own while maintaining full control over the process and system architecture.

Large enterprises with extensive IT departments – organizations using SAP, Oracle, or Dynamics that require custom KSeF integration tailored to their existing system architecture.
Companies with internal development teams – organizations that prefer to implement and maintain KSeF integration internally, with full control over code and processes.
ERP system integrators and implementation partners – companies delivering KSeF projects for their clients and needing a ready-to-use integration component to embed into broader solutions.
Organizations with compliance and audit requirements – entities in regulated sectors (finance, energy, pharmaceuticals) that must maintain full control over data flows and implement their own logging and monitoring mechanisms.

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Key technical capabilities

Sending sales invoices to KSeF – support for individual invoices and batches
Automatic technical validation
Receiving purchase invoices from KSeF – downloading headers and XML files
Handling metadata and statuses – KSeF number, issue/receipt dates, UPO statuses
Handling KSeF downtime – buffering, queuing, automatic retries
Integration via a unified API interface – a single point of contact with KSeF, no need to manage MF sessions
Monitoring and security – encrypted communication, rate limiting, adaptation to MF API changes
Multi-tenant support – handling multiple taxpayers within a single API instance

The architecture is designed with security and scalability in mind. All KSeF authorization methods are supported, including qualified seals and tokens. The infrastructure scales to handle large invoice volumes.

Collaboration model

Delivery of documentation and API specification
Access to a testing environment
Up to 8 hours of technical consultation
SaaS-based access (cloud)

How does the API Connector differ from the full Compass KSeF platform?

The API Connector does not include a graphical interface or a portal for business users. It is a middleware layer dedicated solely to system-to-system communication. If an organization requires an interface for manual invoice processing, verification, or approval workflows, the full Compass KSeF platform is the appropriate choice.

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