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참으로 구글 스럽네요..

SAMPLE FOR IN-APP BILLING VERSION 3 의 Read Me 를 보고 알아냄 ㅠㅠ


4. Grab the application's public key (a base-64 string) -- you will need

   that next. Note that this is the *application's* public key, not the

   developer public key. You can find the application's public key in

   the "Services & API" page for your application.