NetSuite REST API Sales Order and Journal Entry Request Generator

POST https://1234567.suitetalk.api.netsuite.com/services/rest/record/v1/salesOrder
Authorization: Bearer <access_token>
Content-Type: application/json
X-NetSuite-PropertyNameValidation: Error

{
  "externalId": "SO-EXT-1001",
  "entity": { "id": "1234" },
  "subsidiary": { "id": "1" },
  "location": { "id": "2" },
  "memo": "Created via REST API",
  "item": {
    "items": [
      {
        "item": { "id": "456" },
        "quantity": 10,
        "rate": 25.00
      }
    ]
  }
}

Success: HTTP 204 No Content
Location: https://1234567.suitetalk.api.netsuite.com/services/rest/record/v1/salesOrder/<new internal id>

POST https://1234567.suitetalk.api.netsuite.com/services/rest/record/v1/journalEntry
Authorization: Bearer <access_token>
Content-Type: application/json
X-NetSuite-PropertyNameValidation: Error

{
  "subsidiary": { "id": "1" },
  "memo": "Created via REST API",
  "line": {
    "items": [
      {
        "account": { "id": "112" },
        "debit": 1500.00,
        "memo": "Created via REST API"
      },
      {
        "account": { "id": "54" },
        "credit": 1500.00,
        "memo": "Created via REST API"
      }
    ]
  }
}

POST https://1234567.suitetalk.api.netsuite.com/services/rest/record/v1/salesOrder/<sales order internal id>/!transform/invoice
Authorization: Bearer <access_token>
Content-Type: application/json

{}

Upsert by external ID instead of create (same body without externalId):
PUT https://1234567.suitetalk.api.netsuite.com/services/rest/record/v1/salesOrder/eid:SO-EXT-1001

// .NET 6 or later console app (top-level statements)
using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;

var url = "https://1234567.suitetalk.api.netsuite.com/services/rest/record/v1/salesOrder";
var accessToken = Environment.GetEnvironmentVariable("NS_ACCESS_TOKEN");

var body = new
{
    externalId = "SO-EXT-1001",
    entity = new { id = "1234" },
    subsidiary = new { id = "1" },
    location = new { id = "2" },
    memo = "Created via REST API",
    item = new
    {
        items = new[]
        {
            new { item = new { id = "456" }, quantity = 10, rate = 25.00 }
        }
    }
};

using var http = new HttpClient();
using var request = new HttpRequestMessage(HttpMethod.Post, url);
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
request.Headers.Add("X-NetSuite-PropertyNameValidation", "Error");
request.Content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");

using var response = await http.SendAsync(request);
if ((int)response.StatusCode == 204)
{
    Console.WriteLine("Created: " + response.Headers.Location);
}
else
{
    Console.WriteLine((int)response.StatusCode + " " + await response.Content.ReadAsStringAsync());
}