Unique identifier created by the notification service for an app on a device. 
            The specific name for Token will vary, depending on which notification service is being used. 
            For example, when using APNS as the notification service, you need the device token. 
            Alternatively, when using GCM or ADM, the device token equivalent is called the registration ID.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public string Token { get; set; }
 Value
 Value
            The string token.