The Critical PEPPOL AS4 Integration Framework: How to Migrate EDI Systems from AS2 to AS4 Protocol Requirements Without Breaking Supply Chain Operations in 2026
Belgium's January 1, 2026 mandate requiring all VAT-registered businesses to exchange B2B invoices via the PEPPOL network caught many EDI managers off guard. While they scrambled with PEPPOL registration, the deeper technical challenge sits beneath: AS4 is the mandatory transport protocol in the PEPPOL eDelivery network since February