Frient KEPZB-110 alarm keypad

I've just managed to setup Zigbee2MQTT and your plugin. Seems to be working, but now I'm having same troubles.
I have only one Zigbee device and that's a Frient KEPZB-110 alarm keypad.
I want to use this to arm/disarm my alarm system.

When I define this as model "Scene (Rotary)", the alarm action is received in Indigo.
So pressing the arm, disarm, night buttons shows these actions in the action property of the device.

To properly use this device, I also need to receive the "action_code". That field will contain the "PIN-code" that is needed to disarm the alarm.
See https://www.zigbee2mqtt.io/devices/KEYZB-110.html for details.

How can this be done?

... How can this be done?

By me programming some bespoke code in the plugin to handle a "non-standard" device as far as the plugin is concerned.

I will take a look at it and see what I can do, although it might take a while due to other commitments.

Thanks, but don't spend much time on it.
Been playing with that beast last evening and it is quite complicated to get it working.

I'm trying now with MQTT Shims plugin and that is giving some nice results.

Actually: it's working with that plugin. So don't bother looking into it.