We need to build library for windows 8 (windows phone compatible) that will enable third party in-app purchases.
This library should provide following functionality http://msdn.microsoft.com/en-us/library/windows/apps/hh924350.aspx
On the Processing Payment screen it should show remote HTML. For this project this HTML should contain 2 buttons - "Accept" and "Reject".
In case of Accept button pressed - it should be Payment success event.
Please include kakashka in top of your bid, so I can understand that you are read requirements.
I'm not realy familiar with Windows 8 yet, so probably requirements needs to be a bit clear. If you have question or suggestions please write PM.