this version of the application is not configured for billing through google play?

Question

I tried to first implement in my app billing. I have try this library https://github.com/anjlab/android-inapp-billing-v3 and followed the procedures> https://blahti.wordpress.com/2014/07/30/how-to-add-in-app-billing-in-android-part-1/, but I get the response :

"this version of the application is not configured for billing through google play"

Here's what I have done:

1. upload apk in alpha testing with version code: "1" and name version "1.0.0"
2. defining the in-app products (status active)
3. trying to make a purchase through an application that I installed on my android device studio. With version code: "1" and name version "1.0.0"

so how to fix it ?