EDIT 1:
Is it possible to withdraw facebook credits your facebook application has received? So the received credits can go into your real bank account?
ORIGINAL QUESTION:
Is it possible to use facebook users credits to pay for items in a facebook app? If it is possible, can someone please provide a link? Also, how does it work i.e. for 10 facebook credits you have to pay £0.16 or something, and if they pay for an item in a facebook app which costs 10 facebook credits, does that mean the owner of the app gets £0.16? Also, is the owner of the app able to widthdraw this money to his back account. If yes, how much does the whole transaction cost the facebook app developer?
UPDATE 2
as Kurru rightly points out in his answer, facebook credits can be redeemed to developers (just not to users). the Facebook Credits Terms says so, but in a quite convoluted way. better information can be found at Facebook Credits for Developers, incl.
UPDATE 2 END
UPDATE
https://developers.facebook.com/attachment/FacebookCreditsIntegrationGuidev1.pdf , p. 14:
Details (Eligibility, (allowed) Transactions, Redemption, Actions We May Take, Transaction-Related Disputes, Other Terms) are in the Facebook Credits Terms.
UPDATE END
https://developers.facebook.com/docs/creditsapi/ :