The Manager API is enabled by default, but only listens to
localhost connections on port 8090.
If required, the listen port can be changed using the tpm option:
The Manager API can be disabled with the tpm option
Exposing the API to a different network address for remote access, like an internal network, consists in changing the listen address of the API server.
For example, granting access to local 192.168.1.* network would translate to the tpm option:
Note that exposing the API to a public network can introduce a security breach like brute-force or DDoS attack exposure
The Manager specific Developer Docs can be viewed here