where can I find overview of all current operations of the Servicedesk Plus API?

where can I find overview of all current operations of the Servicedesk Plus API?

Is there a overview of all current operations of the Servicedesk Plus API?
Currently it seems that there are four different API's that are not (backwards) compatible and differ in syntax

1) api
2) sdpapi
3) sdpapiv2
4) /api/v3

We're particularly interested in fetching TASKS and CMDB.

PS. I'm new on the forum, if this is not the right way, I like to hear tips

                  New to ADSelfService Plus?