Need documentation for GSQL Server REST API for 3.10.1

I am new to Tigergraph. I was looking for REST endpoint for adding a new vertex type to a graph in version 3.10.1. I couldn’t find the documentation at following:

Now I suddenly see relevant information at:

However, this information is for [TigerGraph Server 4.1.0 Preview]
So I am wondering if is same for 3.10.1 (which we are using). I am getting error:
“Endpoint is not found from url = /gsql/v1/schema/change, please use GET /endpoints to list all valid endpoints.” Somewhere online I found similar issue where Tiger support mentioned that the port for gsql server being different than for REST apis for CRUD etc. So I’ll need to find out the port value from our dba, but wanted a confirmation on the endpoint value like: /gsql/v1/schema/change is it valid in 3.10.1. Also noticed that the new 4.1.0 documentation does not have the built-in-endpoints information mentioned above for 3.10 version.