You can access the RESTCONF API documentation on your switch using the following URL:
http(s)://<IP>:<tcp-port>/apps/restconfdoc/
Replace <IP> with the management IP address of your switch and <tcp-port> with the TCP port configured for RESTCONF. For example, http://192.0.2.16:8080/apps/restconfdoc/.
The on-switch URL works only if you enable the RESTCONF feature on the switch.
For more information about configuring RESTCONF on the switch, see the VOSS User Guide or the Fabric Engine User Guide.
You can also access the RESTCONF API documentation online through the Developer Center (https://www.extremenetworks.com/support/documentation-api/).