     
     /// - Precondition: `AppNetworkState.currentAppState` must not be nil
     public func authenticate(pairingCode: String, completion: Network.ResponseCompletion) {
-        guard let deviceUUID = UIDevice.currentDevice().identifierForVendor else { fatalError("Device must have an identifier to log in") }
         guard let appNetworkState = AppNetworkState.currentAppState else { fatalError("Must configure current app state to log in") }
         guard let url = NSURL(string: appNetworkState.tokenEndpointURLString) else {
             let error = Network.Error.MalformedEndpoint(endpoint: appNetworkState.tokenEndpointURLString)

    }

}

        let parameters = [
            "client_id": pairingCode,
            "grant_type": "device",
            "device_id" : UIDevice.currentIdentifier,
            "device_name" : UIDevice.currentDevice().name
        ]
        
