telegram-bot/modules/CustomChatAddOns/Data/Pong.cs

using Kruzya.TelegramBot.Core.Attributes;
using Newtonsoft.Json;

namespace Kruzya.TelegramBot.CustomChatAddOns.Data
{
    [AllowedSerializableType("pong")]
    public class Pong
    {
        [JsonProperty("confirmation")]
        public string Confirmation { get; set; } = Guid.NewGuid().ToString();
    }
}