Download KSeF (Poland’s e-invoicing system) invoices to an Excel spreadsheet

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TL;DR; Download invoices from Poland's KSeF (Krajowy System e-Faktur) and export them as an XLSX spreadsheet. Handles the full v2 authentication flow automatically. Download KSeF invoices through n8n What it does This workflow connects to Poland's KSeF (Krajowy System e-Faktur) API v2, downloads invoice metadata for a configurable date range, and exports everything as a clean Excel spreadsheet (.xlsx). The spreadsheet includes: KSeF number, invoice number, issue date, seller/buyer NIP and n