AdMob install tracking

Anyone understand how we can track installs for AdMob (for a paid campaign)?

I have read their documentation and it says you have to use tracking URL and third-party tracking solution (like Flurry) but when I create an ad it doesn’t allow me to change the URL!?

In their promote dashboard there is an conversion column. Is the adMob ad SDK enough for tracking?

This is very important when you have a paid campaign to see your ROI.

Any info would be very appreciated.