SameTime APIs Examples

I am aware of the available APIs in V12 >> https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0093607

I would like to understand the steps w/ examples to register an App, and generate a secret & auth token so that I can begin making calls to various APIs.

Specifically, I'm interested in calling user/alerts and sending a broadcast message to a specific set of users.

My initial attempt to register a named app failed.

404
Undocumented

Error: Not Found

I'm not sure if the APIs are not available in our new V12 SameTime environment or whether the I'm calling it wrong :(