Is it possible to create a stream and playlist for the StreamPublisher module using the REST API?
Also, is it possible to “reload” the playlist using the REST API?
No, at this time it is only available through the Java API, but you can wrap up the StreamPublisher module within an HTTPProvider, and allow that to create/manage the Stream object through an HTTP call (similar to REST API)
https://www.wowza.com/docs/how-to-control-stream-class-streams-dynamically-httpstreamcontrol