AdMob : How to query admob for my app earnings

I answer myself.

I was doing some research, and I found that after the recent changes on AdMob, and the migration to AdSense, you must use the AdSense API to get this info.

In particular, each Android app is associated with a "adunit" id, so if you want to check the info of any particular app you might use:

https://developers.google.com/adsense/management/v1.4/reference/accounts/reports/generate

with the following data:

accountId = your Publisher ID (pub-XXXXXXX)
startDate and endDate = The interval of dates you want to check
dimension = AD_UNIT_ID
metric = EARNINGS

With this query you'll have the required info, separated by App.

You get the results in JSON form.