Please provide more context: are you looking to trigger a workflow? Get/modify data?
What are you using to connect to the API? (ie., Node, another Bubble app, etc.)
I could do a bit of that later. However, just read the whole API section of the reference. POST methods are defined as API Workflows. GET methods depend on OBJECTS (things) defined in your database. I’ve learned that you can’t define a POST (workflow) method and make it work as a GET (much is the pity).
Anyway, POST operations are very flexible in Bubble. GETs less so.