InAppBillingPlugin: Android: Object reference not set to an instance of an object.

I haven’t been able to test Android with a real phone until recently and it is failing to make the call to Google Play Store for In-App purchase. I get the following as a catch error with any call: Object reference not set to an instance of an object.

Example of calls are GetPurchase and GetProducts. I have the below code in my MainActivity.cs inside the MainActivity class. Is there a permission that needs to be enable for android. I have access network state, access wifi state, and internet permissions enabled.

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
	base.OnActivityResult(requestCode, resultCode, data);
	InAppBillingImplementation.HandleActivityResult(requestCode, resultCode, data);
}

It feels as though this is a simple item that is missing.

Thanks!