Facebook AppRequest Problem.

Hello there, I already have an app that is live in the app store and google play. I'm looking for someone with experience with the facebook developer platform. The app sends out facebook notifications and I need those notifications to link to this landing page: [login to view URL] For all devices. Desktop, Android and Iphone. If we are able to segment by device it would be better. These would be the destination url per device: iphone: [login to view URL] Android: [login to view URL] Desktop: [login to view URL] Right now all notifications are linking to this empty page: [login to view URL] Basically the job is to simply change the destination url for all facebook notifications. The chosen candidate will be involved for the future work. Thank you.