Matomo + apache ofbiz

Good day.
I am new to webanalytics, so please be patient.
I installed matomo on my home server for testing. I like to track the traffic on a ecommece webpage I am testing too. The package is called apache ofbiz, an open source enterprise resource planning system written in java.
As I can’t find anything on the web specific to matomo/ofbiz, is there somebody in the forum here that can explain me into which files I have to copy the tracking code for the ecommerce module?

Thank you.

Wolfgang