<p>Since 2026, invoices between Polish businesses are XML documents. They go to the national e-invoicing system, KSeF, in a schema called FA(3). The last exemptions end on 1
<p>If you're building a payment system for European banks, at some point you'll need to generate a SEPA credit transfer file in the <code>pain.001</code> format. The spec is 200+
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