CSharpTradeOffers.Trading.EconServiceHandler.ModifyTradeOffer C# (CSharp) Метод

        public SendOfferResponse ModifyTradeOffer(ulong partnerSid, string tradeoffermessage,
            string serverid, uint tradeofferidCountered, TradeOffer offer, CookieContainer container)
        {
            const string url = "https://steamcommunity.com/tradeoffer/new/send";
            container.Add(new Cookie("bCompletedTradeOfferTutorial", "true") { Domain = "steamcommunity.com" });
            string sessionid = (from Cookie cookie in container.GetCookies(new Uri("https://steamcommunity.com"))
                                where cookie.Name == "sessionid"
                                select cookie.Value).FirstOrDefault();

            var data = new Dictionary<string, string>
            {
                {"sessionid", sessionid},
                {"serverid", serverid},
                {"partner", partnerSid.ToString()},
                {"tradeoffermessage", tradeoffermessage},
                {"json_tradeoffer", JsonConvert.SerializeObject(offer)},
                {"captcha", string.Empty},
                {"trade_offer_create_params", "{}"},
                {"tradeofferid_countered", tradeofferidCountered.ToString()}
            };
            return _web.Fetch(url, "POST", data, container, false,
                "https://steamcommunity.com/tradeoffer/" + tradeofferidCountered + "/")
                .DeserializeJson<SendOfferResponse>();
        }

        private static void PollOffers()
        {
            Console.WriteLine("Polling offers every ten seconds.");

            bool isPolling = true;

            var offerHandler = new EconServiceHandler(_config.ApiKey);
            var marketHandler = new MarketHandler();

            Inventory csgoInventory = new Inventory(_account.SteamId, 730);

            marketHandler.EligibilityCheck(_account.SteamId, _account.AuthContainer);
            //required to perform trades (?). Checks to see whether or not we're allowed to trade.

            // ReSharper disable once ConditionIsAlwaysTrueOrFalse
            // ReSharper disable once LoopVariableIsNeverChangedInsideLoop
            while (isPolling) //permanent loop, can be changed
            {
                Thread.Sleep(10000);

                var recData = new Dictionary<string, string>
                {
                    {"get_received_offers", "1"},
                    {"active_only", "1"},
                    {"time_historical_cutoff", "999999999999"}
                    //arbitrarily high number to retrieve latest offers
                };

                var offers = offerHandler.GetTradeOffers(recData).TradeOffersReceived;

                if (offers == null) continue;

                foreach (CEconTradeOffer cEconTradeOffer in offers)
                {
                    TradeOffer offer = new TradeOffer();
                    offer.Them.Assets = cEconTradeOffer.ItemsToReceive;
                    offer.Me.Assets.Add(csgoInventory.Items.First().Value.Items.First().ToCEconAsset(730));
                    offerHandler.ModifyTradeOffer(IdConversions.AccountIdToUlong(cEconTradeOffer.AccountIdOther),
                        "Here you go!", "1", cEconTradeOffer.TradeOfferId, offer, _account.AuthContainer);
                }
            }
        }