Check out this post: Oracle Identity Cloud Service: Integrating with Splunk
https://www.oracle.com/webfolder/technetwork/tutorials/obe/cloud/idcs/idcs_splunk_obe/splunk.html#section4
It's focused on user login data, but does describe how to develop a custom application and ingest its events also.
If you're using the Oracle CASB Cloud Service for security monitoring, it's events may also be exported to Splunk.
Cloud > Cloud Platform > CASB Cloud Service > Exporting Risk Events to Splunk
https://docs.oracle.com/en/cloud/paas/casb-cloud/palug/exporting-risk-events-splunk.html#GUID-4A2052D5-F585-42D0-A7CC-F53106421FF8
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