I'm struggling a bit to get an API endpoint working on version 25.1.3:
http://192.168.10.1/api/interfaces/overview/getInterface?if=wan
It gives me "{"message":"failed"}", while interface wan exists. Am I missing something?
I looked at https://self-hosted.tools/p/opnsense-api-get-ip/ for help:
http://opnsense/api/interfaces/overview/getInterface/vtnet0
... in my case for WAN, or
http://opnsense/api/interfaces/overview/interfacesInfo
... to get a list of all the 'if'.