Initiate AP approval via REST API Scheduler endpoint

I am trying to use the endpoint ess/rest/scheduler/v1/requests to schedule ESS jobs on a daily recurring basis.
This blog mentions that it should be possible: https://blogs.oracle.com/ateam/post/introducing-the-scheduler-rest-api-and-guidelines-for-monitoring-scheduled-processes-in-fusion-cloud-applications

There's also the schedule object in the endpoint's documentation:
https://docs.oracle.com/en/cloud/saas/applications-common/25c/farca/op-ess-rest-scheduler-v1-requests-post.html

Unfortunately, I'm not able to make it work and there's no examples with the schedule in.
I'm also struggling to get the API call to schedule a single ESS job of Initiate AP Invoice approval without the schedule.

I've gotten it to work using the erpintegrations endpoint, but I have not been able to make it work with scheduling a recurrence.