"https://[ProductID].suitetalk.api.netsuite.com/services/rest/record/v1/cashSale" url is working in C# rest api, but if I use "https://[ProductID].suitetalk.api.netsuite.com/services/rest/record/v1/cashSale?limit=1000&offset=241000" parameter we got error "'Unauthorized', " Also If i use Postman, both way is working fine. please help.

Share your code, most likely the base string key is missing the parameters or they are not escaped or sorted correctly

using NetsuiteAPI.Models; using System; using System.Collections.Generic; using System.Linq; using System.Net.Http; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; using System.Web; using System.Web.Mvc; namespace NetsuiteAPI.Controllers { public class Postqueryv2Controller : Controller { TempdataEntities db = new TempdataEntities(); // GET: Postqueryv2 public ActionResult Index() { return View(); } static string GenerateOAuthHeader(string url, string method, string consumerKey, string consumerSecret, string tokenKey, string tokenSecret) { string oauthNonce = Guid.NewGuid().ToString("N"); string oauthTimestamp = ((int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds).ToString(); // Collect OAuth parameters var parameters = new StringBuilder(); parameters.Append($"oauth_consumer_key={Uri.EscapeDataString(consumerKey)}&"); parameters.Append($"oauth_nonce={Uri.EscapeDataString(oauthNonce)}&"); parameters.Append($"oauth_signature_method=HMAC-SHA256&"); parameters.Append($"oauth_timestamp={Uri.EscapeDataString(oauthTimestamp)}&"); parameters.Append($"oauth_token={Uri.EscapeDataString(tokenKey)}&"); parameters.Append($"oauth_version=1.0"); // Construct the base string string baseString = $"{method.ToUpper()}&{Uri.EscapeDataString(url)}&{Uri.EscapeDataString(parameters.ToString())}"; // Generate the signature string signature = GenerateSignature(baseString, consumerSecret, tokenSecret); // Construct the OAuth header string oauthHeader = $"OAuth realm=\"{Uri.EscapeDataString("[ProductID]")}\",oauth_consumer_key=\"{Uri.EscapeDataString(consumerKey)}\",oauth_token=\"{Uri.EscapeDataString(tokenKey)}\",oauth_signature_method=\"HMAC-SHA256\",oauth_timestamp=\"{Uri.EscapeDataString(oauthTimestamp)}\",oauth_nonce=\"{Uri.EscapeDataString(oauthNonce)}\",oauth_version=\"1.0\",oauth_signature=\"{Uri.EscapeDataString(signature)}\""; return oauthHeader; } static string GenerateSignature(string baseString, string consumerSecret, string tokenSecret) { string key = $"{Uri.EscapeDataString(consumerSecret)}&{Uri.EscapeDataString(tokenSecret)}"; using (var hmac = new HMACSHA256(Encoding.ASCII.GetBytes(key))) { byte[] hashBytes = hmac.ComputeHash(Encoding.ASCII.GetBytes(baseString)); return Convert.ToBase64String(hashBytes); } } public ActionResult ContactAsync() { ViewBag.Message = "Your application description page."; return View(); } public async TaskActionResult ContactAsynce(InventoryT model) { ViewBag.Message = "Your contact page."; string accountId = "[ProductID]"; string consumerKey = "9d9ab41910b9e61c2a080daf02ba8e2cc8f0cfdace1d054cbd1853c0eda819fb"; string consumerSecret = "aa3e39c762d525817ad6725b1a2b653d856fdf66140b8c583f355e309e4dbb2e"; string tokenId = "3d49bead592654b05b4058526e1713ea723285b0c8bbc889f3a6d354c7db30a1"; string tokenSecret = "e39d910ac0faba5cd5152783963c389f6e2b86f6e17c6a484932b02cf9528530"; // NetSuite REST API endpoint var trmp = db.GetUrls.Where(x=>x.Id ==6).FirstOrDefault(); string encodedLimit = System.Web.HttpUtility.UrlEncode("1000"); string encodedOffset = System.Web.HttpUtility.UrlEncode("241000"); string apiUrl = "https://[ProductID].suitetalk.api.netsuite.com/services/rest/record/v1/cashSale?limit=1000&offset=241000"; string Location = model.Location; string ToLocation = model.ToLocation; string ItemName = model.ItemName; double ItemQTY = model.ItemQTY; using (var client = new HttpClient()) { // Implement OAuth 1.0a signing logic here string oauthHeader = GenerateOAuthHeader(apiUrl, "GET", consumerKey, consumerSecret, tokenId, tokenSecret); // Set up the request var request = new HttpRequestMessage(HttpMethod.Get, apiUrl); //request.Content = new StringContent(jsonPayload, Encoding.UTF8, "application/json"); request.Headers.Add("Authorization", oauthHeader); // Send the request var response = await client.SendAsync(request); // Handle the response if (response.IsSuccessStatusCode) { string responseBody = await response.Content.ReadAsStringAsync(); TempData["Nicesucc"] = "sdsd"; Console.WriteLine("Inventory transfer successful."); } else { Console.WriteLine($"Error: {response.StatusCode} - {response.ReasonPhrase}"); } } return RedirectToAction("ContactAsync"); } } }

You are not adding the parameters (limit/offset) to base string

string apiUrl = "https://[ProductID].suitetalk.api.netsuite.com/services/rest/record/v1/cashSale?limit=1000&offset=241000";?

var parameters = new StringBuilder();
parameters.Append($"oauth_consumer_key={Uri.EscapeDataString(consumerKey)}&");
parameters.Append($"oauth_nonce={Uri.EscapeDataString(oauthNonce)}&");
parameters.Append($"oauth_signature_method=HMAC-SHA256&");
parameters.Append($"oauth_timestamp={Uri.EscapeDataString(oauthTimestamp)}&");
parameters.Append($"oauth_token={Uri.EscapeDataString(tokenKey)}&");
parameters.Append($"oauth_version=1.0");

// Construct the base string
string baseString = $"{method.ToUpper()}&{Uri.EscapeDataString(url)}&{Uri.EscapeDataString(parameters.ToString())}";

The limit and offset parameters have to be added to the base string https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.1

Hi , I added "string oauthNonce = Guid.NewGuid().ToString("N"); string oauthTimestamp = ((int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds).ToString(); string limit = "1000"; string offset = "241000"; // Collect OAuth parameters var parameters = new StringBuilder(); parameters.Append($"oauth_consumer_key={Uri.EscapeDataString(consumerKey)}&"); parameters.Append($"oauth_nonce={Uri.EscapeDataString(oauthNonce)}&"); parameters.Append($"oauth_signature_method=HMAC-SHA256&"); parameters.Append($"oauth_timestamp={Uri.EscapeDataString(oauthTimestamp)}&"); parameters.Append($"oauth_token={Uri.EscapeDataString(tokenKey)}&"); parameters.Append($"oauth_version=1.0"); parameters.Append($"limit={Uri.EscapeDataString(limit)}&offset={Uri.EscapeDataString(offset)}"); / I added this one but I am not sure it is correct? // Construct the base string string baseString = $"{method.ToUpper()}&{Uri.EscapeDataString(url)}&{Uri.EscapeDataString(parameters.ToString())}";" to my code but I still got Authorize problem using that Request Parameter limit and offset issue..

Parameters need to be sorted alphabetically

So, var parameters = new StringBuilder(); parameters.Append($"limit={Uri.EscapeDataString(limit)}&offset={Uri.EscapeDataString(offset)}"); parameters.Append($"oauth_consumer_key={Uri.EscapeDataString(consumerKey)}&"); parameters.Append($"oauth_nonce={Uri.EscapeDataString(oauthNonce)}&"); parameters.Append($"oauth_signature_method=HMAC-SHA256&"); parameters.Append($"oauth_timestamp={Uri.EscapeDataString(oauthTimestamp)}&"); parameters.Append($"oauth_token={Uri.EscapeDataString(tokenKey)}&"); parameters.Append($"oauth_version=1.0");