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The National e-Invoicing System, known as KSeF, is Poland’s central platform for issuing, receiving, and storing structured electronic invoices. Instead of sending a PDF as the primary business document, companies must generate invoices in the required XML structure and submit them through KSeF or an approved integration.

A reliable workflow should separate standard processing from exception processing. Straightforward invoices should move automatically. Tax, data, authorization, or operational exceptions should be sent to a human with enough context to make a decision quickly.

Rejection handling is where many basic integrations fail. A system that only submits invoices is not a complete automation solution.