I've been developing a desktop PC game in Unity which connects to Facebook in order to post messages about the player's progress (high score etc). The chosen method of how the app integrates with Facebook is currently set to "Website with Facebook Login". Everything is already set up and working (Open Graph stories, action and types) but after trying to submit the app for review, it appears desktop apps are not allowed to be configured this way.
The question I am asking is, if desktop apps are not allowed to use App Center, what are the preferred methods of posting messages to a users wall? There is the option of using normal feed posting but it is my understanding that this approach does not allow custom stories and will only display a generic message.
Does anyone have experience with the matter or perhaps has integrated it in their own game / app in the past?