: Built on SOAP 1.2 with attachments, ensuring compatibility with standard enterprise environments.
: Supports Push, Pull, and Sync exchange patterns. The Pull feature is critical for trading partners with non-addressable endpoints or those behind firewalls. as4.zip
: Can transport virtually any file type (XML, JSON, PDF, binary, etc.) without tying them to specific SOAP actions. Security & Reliability eDelivery AS4 - 1.14 - European Commission : Built on SOAP 1