I couldn\'t find anything on the web. Is there a way to use the AdMob SDK to monetize my app without having the app in the Google Play store.
Anybody of you who may
You do not need to distribute your app through Google Play in order to use AdMob SDK. Regardless of the distribution method, it will work as long as it's correctly configured.
Google Play is just a way to distribute your apps.
you can use admob in testmode like:
request.addTestDevice(AdRequest.DEVICE_ID_EMULATOR);
or
request.addTestDevice(AdRequest.TEST_EMULATOR);
Taken from https://forums.coronalabs.com/topic/46289-how-to-use-admob-in-test-mode/