Nuki Opener and Arduino

Because Nuki Opener is incompatible with my door system I am looking at my options. So next solution that I have is to use Arduino to control my front door. Now I can use ESP8266 and control my door that way, but I would like to integrate Nuki Opener with Arduino so that I can use Nuki App. So my question is, is there any serial integration between Nuki Opener and Ardiunio possible? Or, can I use Nuki Opener to trigger input on Arduino?

I am using a Nuki Opener with an Arduino (TinyPICO, to be specific). See Make your intercom smarter with an MQTT backpack - Michael Stapelberg for how I wired it up. The Arduino sketch is

Nice! Thanks a lot!