Peppox Peppol FAQ — your concise guide to EN 16931 e-invoicing, BIS Billing 3.0/PINT, identifiers (ISO 6523), SMP/SML discovery, AS4 transport, participants, document types, and Access Points. Important: laws change by country/region—always verify local regulations. This page is informational only; Peppox is not liable for errors or legal changes.