Kiss Metrics Ruby API

hey there I have a question about the ruby API for an event I would like
to add that is happening in a user dashboard of ours.

Our whole site is tracked using the javascript API but there is a
particular state 'done' that has to be completed by different user
logging into a dashboard and clicking a checkbox which then triggers
this "done" state. There has been a hook has been set up in a model for
callback when the state changes so now i need to use the Ruby API to
send this info to KISS

so in the model I need to walk through the object relationships and find
the user to identify when the event is reported

can it be done like this:

when :booked
        KM.init("Our API KEY")

or do I need to find the user's email with another method before
initiating the API key?