Need help Android in app purchase

Hello, I have an app on beta in the google play.
The app is done the only thing left is the in-app purchases.

I have the following code:

I tried buying, the money went to my merchant account, but the on success node didn’t hit, so I didn’t get the variable I tried to save (dragondust).

What could have gone wrong? Anything wrong with the code? the identifier and the slotnames are correct.

The purchase was succeful, but the function On Success didn’t go on.

Any ideas?

Also… The api I use to compile the app is 19, and the version I tried to buy the consumable is Android 5.0.