How to use Prime31 Google In App Billing Plugin - unity3d

Question

I just bought "Google In App Billing Plugin for unity3d" by Prime31. I don't understand how to use it in the game that I want to develop.
Can you please show me a code example? I understand I need to use my app key, but I don't know what to do next.
And how to a I make test purchases with this plugin?
Please help as much as you can, because I am really stuck on this subject for quite a while.
This is some of my "purchase maker" object called MoneyTakerScript (inherits from MonoBehaviour):
void Start()
{
string key = "My App Key...";
GoogleIAB.init(key);
var skus = new string[] { "cl.48931", "tp.58932", "mmm.68393" };
GoogleIAB.queryInventory( skus );
TPS = GameObject.Find("TPBtn").GetComponent(typeof(TPScript)) as TPScript;
CLS = GameObject.Find("CLBtn").GetComponent(typeof(CLScript)) as CLScript;
MMM = GameObject.Find("MMBtn").GetComponent(typeof(MMMScript)) as MMMScript;
}
public void Purchase(string ProductId)
{
GoogleIAB.purchaseProduct(ProductId);
}
public void UseProduct(string ProductId)
{
if (ProductId.Contains("cl"))
{
CLS.MakeCL();
}
if (ProductId.Contains("tp"))
{
TPS.MakeTP();
}
if (ProductId.Contains("mmm"))
{
MMM.MakeMMM();
}
GoogleIAB.consumeProduct(ProductId);
}
And this is some of my "purchase listner" object code:
void purchaseSucceededEvent(GooglePurchase purchase)
{
//Debug.Log( "purchaseSucceededEvent: " + purchase );
MoneyScript.UseProduct(purchase.productId);
}
void Start()
{
MoneyScript = GameObject.Find("MoneyTaker").GetComponent(typeof(MoneyTakerScript)) as
MoneyTakerScript;
}

Answer 1

I found the problem and solved it!
This line was missing in my AndroidManifest.Xml for some reason:
<activity android:name="com.prime31.GoogleIABProxyActivity"></activity>
Just added the line and now I have In App Purchase!!