Why Android-inapp-billing-v3 Library Needs Two Attempts To Purchase?

I am trying to use android-inapp-billing-v3 library to implement in-app purchases inside my simple app. I'am using this library( https://github.com/anjlab/android-inapp-billing-v3)

Solution 1:

You have to add

   @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (!bp.handleActivityResult(requestCode, resultCode, data))
        super.onActivityResult(requestCode, resultCode, data);
}