I'm trying to add in-app purchases into my Android game and it having some trouble figuring my around the Google Play Billing. Can anyone refer me to a good open source reference for how to do that?
I came across an open source resource that simplifies in-app billing on Android. Take a look at http://soom.la. They also have a reference app that shows you how to use it. Here is the sample app on Github
I'm using Unity, they also provide a free plugin on the Unity Asset Store: https://www.assetstore.unity3d.com/en/#!/content/6103.