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func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let deviceTokenString : String = deviceToken.map{ String(format: "%02x", $0) }.joined().replacingOccurrences(of: "<", with: "").replacingOccurrences(of: ">", with: "").replacingOccurrences(of: " ", with: "");  
        var properties = [String:String]()
        properties["OM.sys.TokenID"] = deviceTokenString
        properties["OM.sys.AppID"] = "AppID"
        Visilabs.callAPI().customEvent(@"RegisterToken", withProperties: dic)
    }