I already successfully use the API for manipulating FreeRADIUS users and reading DHCPv4 leases.
Using the OPNSense API Reference, I have been unable to discover how to list the contents of any specific Firewall Alias. I have tried many commands for both the alias and alias-util controllers.
Can this be done?
If so, could somebody provide a one line hint using curl?
So it looks as if it cannot be done.