The Oracle E-Business Suite Integrated SOA Gateway service-enables Oracle E-Business Suite public APIs for Service Oriented Architecture. This feature was released in Oracle E-Business Suite Release 12.1.1.
This enablement process is normally performed through the Integration Repository user interface (UI). However, it is recommended that the service generation and deployment be performed through backend processing in a multinode environment. This is because in a multinode environment, if a service is generated through the UI, we may not know in which node the service artifact will be actually generated and the user would have to check it on each node.
I will also recommend to go through the excellent presenation by ATG Development team on ISG.
For more information, you could also refer:-
Note: 556540.1 – Installing Oracle E-Business Suite Integrated SOA Gateway, Release 12
Note: 726414.1 – Oracle E-Business Suite Integrated SOA Gateway Troubleshooting Guide, Release 12
Note: 565922.1 – Oracle E-Business Suite Integrated SOA Gateway Release Notes, Release 12.1.1