How to create a new chat room using API?

Can someone explain by a clear example how to manage conversations using API?
I can easly create a new user calling the following API:
and sending POST data as userid and password of the user I want to create.

Is there a way to do the same to create a new chat room?

Thanks, the problem was that the API address was relative to v4 and my version is v2

Right, Conversations management - Nextcloud Talk API documentation it is