AS4
AS4 (Applicability Statement 4) is an OASIS standard protocol for secure and reliable business-to-business (B2B) document exchange over the internet, based on web services. It extends the ebMS (ebXML Messaging Service) 3.0 standard to simplify implementation and interoperability, using SOAP and WS-Security for message handling. It is widely used in industries like e-procurement, logistics, and finance for electronic data interchange (EDI) and other B2B communications.
Developers should learn AS4 when building or integrating systems for B2B data exchange that require standardized, secure, and reliable messaging, such as in supply chain management, healthcare, or government sectors. It is particularly useful for replacing legacy EDI systems with modern web services, ensuring compliance with regulations like eIDAS in Europe, and enabling interoperability between different organizations' IT systems.