KSeF 2.0 .NET (C#) – Integration Library

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  • Version 1.2.3
  • Download 537
  • File Size 1.85 MB
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  • Create Date June 17, 2025
  • Last Updated February 10, 2026

KSeF 2.0 .NET (C#) - integration library

.NET Client Library (C#) for KSeF 2.0 REST API

Integration library written in JAVA that allows integration with National e-Invoice System - KSeF 2.0 REST API. The ZIP package contains the library, source code, data model, and error return codes. Implementation details, along with sequence diagrams describing the order in which individual operations are called, are described on the website. Documentation.

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