Ksefnik FAQs

Question 1

How does Ksefnik handle invoice reconciliation?

Accepted Answer

Ksefnik features a 6-step Reconciliation Engine that automatically matches KSeF invoices with bank transfers from various Polish banks (MT940, mBank, ING, PKO BP, Santander). It extracts NIPs, uses fuzzy matching, and handles partial payments for accurate matching.

Question 2

What is the Model Context Protocol (MCP) Server for?

Accepted Answer

The MCP Server integrates Ksefnik with AI agents like Claude Desktop, Cursor, and other MCP clients. This allows developers to interact with KSeF functionalities – such as querying invoices, importing bank statements, and running reconciliation – directly through natural language prompts.

Question 3

What is Ksefnik?

Accepted Answer

Ksefnik is a comprehensive open-source TypeScript/Node.js SDK designed for Poland's KSeF 2.0 e-invoice system. It provides a production-ready HTTP client, a powerful engine for invoice reconciliation with bank statements, and an MCP server for AI integration.

Question 4

Which bank statement formats does Ksefnik support?

Accepted Answer

Ksefnik includes Bank Parsers that support standard MT940, as well as CSV formats from major Polish banks like mBank, ING, PKO BP, and Santander. It features automatic format detection and NIP extraction from transaction titles.

Question 5

Can Ksefnik be used for offline testing?

Accepted Answer

Yes, Ksefnik provides a KSeF Simulator, a local mock server that allows for offline testing without connecting to the Ministry of Finance. It comes with predefined scenarios for happy-path, timeouts, invoice rejection, and session expiration.

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