We've made it easy to use Mixpanel with Highlight. When you initialize Highlight, you can set your Mixpanel Project Token.
Calling H.track() will forward the data to Mixpanel's track(). Highlight will also add a Mixpanel property called highlightSessionURL which contains the URL to the Highlight session where the track event happened.
Calling H.identify() will forward the data to Mixpanel's identify().