Android In App Billing Note

The Item that you were attempting to purchase could not be found, while download app from google play

1. check if the apk is uploaded and published aka 已發布 (even in Alpha stage)
    in Developer Console, the Apk , right up corner
2. check the SKU name
3. IAB need to test in REAL device (not virutal device like AVD)
4. the google account of the test device can not same as the Developer Console's account
5. the test apk should use same version number and same key to signed as the uploaded apk