AS4
A web-services-based successor to AS2, used in particular by the Peppol network for cross-border invoice transport.
In practice
AS4 messages are SOAP-based, support multi-hop transmission, and are required for Peppol traffic.
Why it matters
Peppol compliance requires AS4 - AS2 will not work.
Related terms
How Sable handles it
Sable's Peppol Access Point is built on a certified AS4 implementation.
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