To plan your soa based integrations, the architects and business users need to know what services are available within ebs that can be leveraged to be a part of your information integration, business process integration or coming up with composite application spanning across enterprise silos.
The first step when planning and designing your integrations should be to use Oracle Irep. This will give you the details of the business services available within EBS and also the details of service end-points. IRep lets users easily discover the appropriate business service interface for integration with any system, application, or business partner.
It is a pre-built central catalog of information about the numerous public integration interfaces delivered with Oracle applications, known as business interfaces.
The key advantages of using Irep are
Using Irep
Go to http://irep.oracle.com/
If you are working on EBS R12: From the Navigator menu, select the Integration Repository responsibility, then click the Integration Repository link that appears.
Browse IRep
: You can browse Irep using the categories of product or by the integration standards you wish to leverage.
Search IRep:
IRep also lets you search using various search parameters. You can search by interface name, internal name, product family, interface type (concurrent program, web service, XML gateway map etc), product, and business entities.
In Release 12, the Oracle Integration Repository will ship as part of the E-Business Suite. As your instance is patched, the repository will automatically be updated with content appropriate for the precise revisions of interfaces in your environment. But until Release 12 is available, you can explore an on-line version of the Integration Repository for the 11i10 version of E-Business applications. 
