public static void getHistoryBuyOrders(ListingsView view)
        {
            var request = new RestRequest("commerce/transactions/current/buys");
            Action<List<RestListing>> arp = view.processHistoryBuyOrders;
            executeAsyncWithKey(request, arp);
        }

public static void executeAsyncWithKey<T>(RestRequest request, Action<T> callback) where T : new()
        {
            var client = new RestClient();
            client.BaseUrl = BaseUrl;
            request.AddParameter("access_token", APIKEY);

            var asyncHandle = client.ExecuteAsync<T>(request, aresp =>
            {
                callback(aresp.Data);
            });
        }