Oracle is quietly shipping a second REST layer across Fusion -- the BOSS services at /api/boss. They query differently, they authenticate differently, and the authentication difference is the part that will cost you an afternoon. Here is what I found running them against a live pod.
Using XSLT logic in Oracle Integration Cloud to build web service payloads whose attributes change based on runtime conditions.
A reusable integration pattern for pulling data out of any Oracle BI Publisher report or data model via the ReportService web service.
Template params, query params, attachments, or payloads - how to choose, and how to expose an OIC REST service that accepts a JSON payload.
A walkthrough of building an app-driven OIC orchestration that starts from a REST trigger and passes information back to the caller.
OIC terminology decoded - when you Invoke a connection versus expose a Trigger, and how to create a REST connection for each role.