Definition
AS4 (Applicability Statement 4) is an open OASIS standard, built on the ebMS3 framework, for secure and reliable B2B message exchange over HTTP. It specifies built-in support for reliable delivery (receipts and automatic re-send on failure), compression and WS-Security-based encryption - without requiring a dedicated VPN tunnel between the parties. AS4 is the transport protocol the PeppolEuropean network for e-invoicing and e-procurement - uses AS4 as its transport protocol. Norway is among the countries with mandatory e-invoicing via Peppol for the public sector. network requires for e-invoicing and e-procurement, and is also used as an alternative to older SOAPSimple Object Access Protocol - XML-based messaging protocol used in enterprise integrations, including Elhub./EDIFACTUN standard for electronic data interchange. In the power market it is used where messages go directly between market participants, and in systems that predate the national hubs.-based message flows where parties want a more modern, standardised transport layer. HANDSALTvimenning’s EDI server for bilateral message exchange: receives, translates, routes and acknowledges messages between companies and marketplaces. supports AS4 alongside EDIELThe Nordic standard for message exchange in the power market. In Norway it now means Elhub's XML messages, in Sweden it is still EDIFACT., ECPEnergy Communication Platform - EU-standardised interface for secure data exchange between actors in the European power market., Peppol and EDIFACT, so the customer does not have to pick a protocol per trading partner themselves.