AS2 protocol
AS2 transports EDI documents over HTTPS with digital signatures, encryption and signed receipts, which is why most large retailers require it.
Security model
Documents are signed and encrypted with X.509 certificates, so integrity and origin are provable.
MDN receipts
The signed receipt is legal proof of delivery, returned synchronously or asynchronously.
Managed certificates
EDIconnect operates its own AS2 stack and handles certificate renewal and partner configuration.