I get 'Use of undeclared identifier' error for _messengerUrlHandler when I do everything on the documentation: https://developers.facebook.com/docs/messenger/ios
Is it something I should define?
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Yes. I think it is just a variable that is declared globally, probably as a property. It's an instance of FBSDKMessengerURLHandler.
On considering it a bit further, I think this variable is supposed to contain the class that you write that implements FBSDKMessengerURLHandler. You can't just instantiate it, because it is an abstract class. Instead you must derive a class from it and implement code for the functions in the abstract class.
Bruce Cichowlas
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