In the game I'm currently developing, we would like to have an inbox listing all pending Requests that the friends have sent to the currently logged in user. I know how to get some basic information out of the Graph API, but I'm lost on this one as I can't find any resources on how to do what I have just described.
Get all requests by a GET request /me/apprequests with a game type application with a valid access token.
You can get reference https://developers.facebook.com/docs/games/requests/