ISG and Mobile Foundation to enable HR webservices

Our requirement is to enable webservices to perform operations such as "Get employee details", "Get employee supervisor", "get employee planned leaves", "if the employee has setup delegation then delegated email id" etc.

Which could be utilised by other corporate applications and mobile applications.

Installing Oracle E-Business Suite Integrated SOA Gateway, Release 12.2 (Doc ID 1311068.1)

The above article mentions that REST services can be enabled on the same EBS server by applying patches but to enable SOAP webservices, we need to install SOA Suite.

but after enabling applying patches related to REST services, we found that using REST services we could perform create/update employee (as it is a PL/SQL API)but not GET, but there is a Business Service Object API which contains the services to get employee details, supervisor etc.