I noticed that some Facebook apps like BranchOut have custom notifications. When an application request is sent and appears in the upper left center of notifications, the text in the notification is what they apparently control on their own, instead of the standard "Name sent you a request."
From what I find in the documentation, this is not possible. Custom messages are displayed only for users who are already using the application, otherwise you will receive a message about the invitation by default to Facebook.
Does anyone know how they do this? Do they just have a deal with Facebook, or are they posting something other than the app?
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