A unique number that's assigned to each AdSense account. You can find your AdSense customer ID by going to 
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AdSense customer ID
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‘My AdMob Help Page’ - your personalized Help Page to help you thrive on AdMob.
Introducing our newly revamped My AdMob Page, a personalized Help page that houses relevant information for your account.
You can better maintain your account health, ensure necessary setup is completed and have the right optimization tips targeted to your apps. Stay tuned for more!