Integrating an ERP system with KSeF step by step
Plan invoice submission and retrieval, divide responsibilities between accounting and IT, and verify the implementation after errors and restarts as well.
TechnologyOctober 15, 2026
Technology
KSeF technology explained: API, FA(3) XML, validation, data security, integrations and architecture for automated invoice workflows.
Articles and instructions
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How to read XML from KSeF
Learn how to open an FA(3) XML file, find invoice data, the KSeF number, tax IDs, line items and amounts, and when to use a validator or XML-to-PDF converter.
TechnologyJune 9, 2026
KSeF and JPK: how the invoice system works with the JPK family of structures
KSeF does not replace JPK_VAT. Learn the differences between FA(3), JPK_V7M, JPK_V7K and JPK_FA, and the rules for KSeF numbers, corrections and offline modes.
TechnologyJune 6, 2026
XML and the FA(3) schema in KSeF - a guide for businesses
What XML is, why KSeF requires it, and why FA(2) no longer works in 2026. A practical guide without technical jargon.
TechnologyApril 17, 2026
XML Validation and Processing in KSeF – How the Platform Interprets an Invoice
In the KSeF system, an invoice is not a visual document but a structured XML file. Learn about the multi-step validation and parsing process that determines whether an invoice is accepted.
TechnologyMarch 16, 2026