Oracle has just released BPM 126.96.36.199 Bundle Patch 3 which adds the out of the box web interface for Advanced Case Management and REST APIs for working with BPM.
The patch is available from Oracle Support, it is patch number 18072286.
And here is an example of using the REST API. You can call the REST URL (GET) http://yourserver:port/bpm/services/rest/application.wadl to get details of the available services:
Read the complete article here.
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