Android Market Donate Options
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I wish to add a support the developer option to an android application that I am developing.  

There is an app on the market called Metro Messaging Beta.  This app has a donate option that lets you select a donation tier.  Once you click an option it takes you to an Android market page to actually purchase the donation.  It is really slick and integrates well.  Technically it might be an activation purchase or something like that.  

How would I go about doing that?  I want an option to donate that will not show up on my developer page on the android market. 