Get cost and type

public async Task<object> GetCostListDelivery(string access_token, Guid beneficeryId)
        {
            using (var client = new HttpClient())
            {
                try
                {
                    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

                    client.DefaultRequestHeaders.Authorization =
                     new AuthenticationHeaderValue("Bearer", access_token);

                    var queryParameters = new Dictionary<string, string>
                    {
                        { "beneficeryId", beneficeryId.ToString() },
                       
                    };
                    var dictFormUrlEncoded = new FormUrlEncodedContent(queryParameters);
                    var queryString = await dictFormUrlEncoded.ReadAsStringAsync();

                    var url = root + "/api/Payment/GetCostListDelivery";
                    HttpResponseMessage response = await client.GetAsync(url + $"?{queryString}");

                    if (response.IsSuccessStatusCode)
                    {
                        string result = await response.Content.ReadAsStringAsync();
                        JArray jsonArray = JArray.Parse(result);
                        return jsonArray;

                    }
                    else return response.StatusCode;
                }
                catch (Exception e)
                {
                    return "Exception: " + e.Message;
                }
            }
        }

[
    {
        "Key": "Regular",
        "Value": 0.0
    },
    {
        "Key": "Our",
        "Value": 15.0
    }
]