Facebook Credits. Error 1151

Question

I am developing an application on Facebook, and I need to be able to integrate my application on other sites (with a Facebook connection using the JavaScript JavaScript API).

On Facebook, I can buy something in the application using Facebook Credits, but on some other site, when I call the Facebook purchase dialog, I get this error:

API Error Code: 1151 API Error Description: Sorry, but this app may not be eligible to accept Facebook Credits. If this app has accepted credits before, please try again. Error Message: Invalid Application 

Or is there a Facebook purchase dialog that we can only use on Facebook?

Answer 1

This is because the payment interface can only be called from the iframe application running on Facebook.