Refresh Convert Request

public async Task<object> RefreshConvertRequest(string access_token, Guid RequestId)
        {
            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>
                    {
                        { "RequestId", RequestId.ToString() },
                        

                    };
                    var dictFormUrlEncoded = new FormUrlEncodedContent(queryParameters);
                    var queryString = await dictFormUrlEncoded.ReadAsStringAsync();

                    var url =  root + "/api/Payment/RefreshConvertRequest";
                    var response = client.PostAsync(url + $"?{queryString}", null).Result;

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

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

{
    "Status": "Refresh Convert Quote Successfully",
    "convertRequest": {
        "RequestId": "6287135b-ba0b-4c1d-8471-abd32433b6e0",
        "BuyAmount": "100.00 EUR",
        "ChargeAmount": "344.08 ILS",
        "FinalQuote": "3.44084"
    },
    "Errors": null
}