Windows 8 in-app purchase SDK

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
Microsoft allows 3rd party in-app purchase payment providers.
Here is an paypal example .
Here is an user experience

So we need SDK like PayPal but with one exception: Insted of paypal page we just need fake HTML page with 2 buttons "Pay" and "Cancel".

Additional Project Description:
04/11/2013 at 12:20 PDT
Some explanations

We need SDK that allows app developers use 3rd party payment gateway.
SDK is should consist of only 3-5 methods.
And also no payment gateway need to be integrated, just fake 1 page HTML with 2 buttons on it.

Skills required:
C# Programming, Javascript, Windows 8, Windows Phone
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