How to generate android instanceId in mobile scripting using Vugen

Goodevening gents,

I have generated a mobile web script for a banking app. The first request is a POST (attached) with a value called instanceId that returns dynamic auth tokens that are used in other requests. I think the instanceId value was generated on the android device and hence can't be correlated from the server response.

When I google, I could find some code to generate the Id but I don't know how to run this code in vugen without SDK. 

String iid =InstanceID.getInstance(context).getId();

Any help/guidance is much appreciated.

 Thanks