<p>Poland made B2B e-invoicing mandatory. Biggest companies from 1 February 2026, everyone else from 1 April 2026. Invoices to companies now go through KSeF, a government system.
<p>If your SaaS already does B2B billing for customers in Europe, sooner or later one of them will ask: <em>"Can you send my invoices through Peppol?"</em></p> <p>Belgium has
<p>Romania's e-Factura is mandatory, and the hard part isn't the <em>idea</em> — it's ANAF's stack. You hit SOAP endpoints, an OAuth + digital-certificate lifecycle, and rejection
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