Yes there is an API. You can read the documentation here
You’ll need the backend authorization token in the header X-ZT1-Auth. Then you can post to localhost:9993/network/${network_id} with payload {"allowManaged": true} and you’ll join the network. (There’s also allowGlobal, allowDNS, allowDefault options)
If you want to authorize the node on the network, you’ll still need the Central API as well. The one I pointed you at will just have the client attempt to join the network.
What is the endpoint and payload for the central authorization.
I’ve tried network//member/ and a payload of { config: { authorized: true }} but on the dashboard the node’s ip is not displayed and there is not zt interface on the node itself.
Sounds like you did the central authorization just fine. Central API docs are found here
You cannot just post to the Central API and have the node join a network. You have to use the local Service API described above for it to join the network