gistfile1.as

// import the library - this will change based on where you put it
import MixpanelLib;

// initialize with your project token
internal var mpmetrics:MixpanelLib = new MixpanelLib("YOUR TOKEN");

// track events with ease
private function sendPhoto():void {
    // Do stuff
    mpmetrics.track("Sent photo", {'type': 'png'});
}