How to get your unique google play app url to set up AdMob IDs.
http://developer.android.com/distribute/googleplay/promote/linking.html#OpeningDetails
AdMob will ask for the url when you are setting up the app for a mediation ID. It starts off with: (market://details?id= ) all you need is you app info to finish it. You get that from your play account. Go to the and when your on the screen where you upload your apk just grab everything after the =. That is your package name.
ie:
market://details?id=<package_name>
example:
market://details?id=com.a64221…….
Mike