The Android's developer guide for In-app billing V3 comes with a sample app called TrivialDrive. In it, there's an utility class called IabHelper, which the guide advise us to import on our own apps.
I would like to know if there is an online documentation for the IabHelper class? I searched through d.android.com but didn't find anything. Or should I just extract the Javadocs from the source files instead?