Simple examples of implementing CallTrackingMetrics FormReactors
There are comments and TODOs in the code. You will need to create a basic FormReactor. You do not need to add any special fields. If you add your CTM Tracking Code and setup a tracking number, tracking source, and target number, you should be able to get visitor data.
You can use python to run a simple server. Run one of the following in the repository directory and browse to http://localhost:8000/form-js.html
python -m SimpleHTTPServer 8000
python3 -m http.server 8000