One of the first steps in the transition process will be to assemble all existing service endpoints and consider a migration strategy for each. Depending on the degree of maturity of an organisation, this may be just a question of going into OAC or an existing UDDI registry to obtain the endpoint URLs. Oracle Enterprise Repository can be used to harvest existing services where these have not previously been documented and collated, but this product does not enable automated conversion of services to APIs.
A design authority, which should include business stakeholders, must decide which APIs and data will be exposed externally through the gateway and how. This is not a trivial task and careful consideration is ...