In this paper, the overall Technical Architecture of Korea-Japan e-Trade Hub Project is introduced. The scope of the project, what we have done, the future works, and lessons learned will be delivered. Topics in the paper include:

- Business Document Standard (XML DTD by PAA)

- Business Process

- Interconnection Specification between Service providers

- Messaging Service for Trading Partners

- Security by XML Signature, Encryption, HTTPS

- Profile & Agreement of Service Providers and Trading Partners