https://groups.google.com/forum/#!topic/adsense-api/tS_3G9OC8Eg
Google UK Limited에 근무하는 "Sérgio Gomes"가 service account로 AdSense Management API를 호출하는 것은 불가능하다고 했다.
you can't use service accounts with the AdSense Management API, since it accesses protected user data
https://stackoverflow.com/a/37303865/262425 에서도 불가능하다고 했고,