Unity + Google Checkout on Ando

I have a project which needs to be able to access google checkout in an android device so a user can buy extras for his game. Do you know of a plugin that already does this?
If not what is the best path to accomplish this? I’m guessing it’s using C++ and JNI to make calls for android components inside an android application that’s running at the same time as the game and that handles all the requests, but that sounds dirtier than a tijuana bible, so any feedback would be greatly appreciated.

You’re not allowed to bypass the in-app purchase system. Since Google introduced in-app purchases, any in-app purchases must be done via Market in-app purcahse API.

Implementing Google Checkout, PayPal or something else directly in your app will violate the Android Market Terms of Service.