Converting PDF file to text in C# using VS2022

PdfTextExtractor.cs

using System;
using System.Net;
using System.Text;
using System.Text.Json;

namespace PdfTextExtractor
{
    class Program
    {
        // When you have your own client ID and secret, specify them here:
        private static string CLIENT_ID = "FREE_TRIAL_ACCOUNT";
        private static string CLIENT_SECRET = "PUBLIC_SECRET";
        private static string API_URL = "https://api.whatsmate.net/v1/pdf/extract?url=";

        static void Main(string[] args)
        {
            // TODO: Specify the URL of your small PDF document (less than 1MB and 10 pages)
            // To extract text from bigger PDF document, you need to use the async method.
            string pdfUrl = "https://ospi.k12.wa.us/sites/default/files/2023-08/jokes.pdf";

            try
            {
                string text = ExtractText(pdfUrl);

                Console.WriteLine("===============================");
                Console.WriteLine("PDF TEXT IS AS FOLLOWS:");
                Console.WriteLine(text);
                Console.WriteLine("===============================");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
            }

            Console.WriteLine("Press Enter to exit.");
            Console.ReadLine();
        }

        static string ExtractText(string pdfUrl)
        {
            string fullUrl = API_URL + Uri.EscapeDataString(pdfUrl);
            
            var request = WebRequest.Create(fullUrl) as HttpWebRequest;
            request.Method = "GET";
            request.Headers["X-WM-CLIENT-ID"] = CLIENT_ID;
            request.Headers["X-WM-CLIENT-SECRET"] = CLIENT_SECRET;

            using (var response = request.GetResponse() as HttpWebResponse)
            {
                using (var reader = new System.IO.StreamReader(response.GetResponseStream()))
                {
                    string jsonResponse = reader.ReadToEnd();
                    
                    // Parse JSON response using System.Text.Json
                    using (JsonDocument doc = JsonDocument.Parse(jsonResponse))
                    {
                        JsonElement root = doc.RootElement;
                        
                        if (root.TryGetProperty("text", out JsonElement textElement))
                        {
                            return textElement.GetString();
                        }
                        else if (root.TryGetProperty("error", out JsonElement errorElement))
                        {
                            throw new Exception($"API Error: {errorElement.GetString()}");
                        }
                        else
                        {
                            return jsonResponse;
                        }
                    }
                }
            }
        }
    }
}