How to implement Platoevolved's In app billing with NGUI?

How can I make NGUI buttons with Platoevolved’s In App Billing Plugin for Android? I am a noob when it comes to using NGUI.

It is easy. First you must learn NGUI

http://www.tasharen.com/?page_id=197

Next, learn about your plugin api

http://www.platoevolved.com/blog/unity-plugins/#!/~/product/category=2743024&id=13203885

Now, study a little of unity3d plugins

So far, so good. Now you it is good to create some prototypes with one of each tecnologies unitil you understand what is really happens.

And them, implement your final version with everything together.