using System;

using System.Net.Http;

using System.IO;

using Newtonsoft.Json.Linq;

using System.Threading.Tasks;

​

public class IssueCredentialClient

{

    private static readonly string ApiEndpoint = "https://v3.legitdoc.com/credential/issue"; // replace with your API endpoint

​

    public async Task<string> IssueCredentialAsync(

        string authToken,

        string batchName,

        string fields,

        string signatureB64,

        string qrX,

        string qrY,

        string qrSize,

        string filePath)

    {

        using (var client = new HttpClient())

        {

            using (var formData = new MultipartFormDataContent())

            {

                formData.Headers.Add("token", authToken);

​

                formData.Add(new StringContent(batchName), "batchName");

                formData.Add(new StringContent(fields), "fields");

                formData.Add(new StringContent(signatureB64), "signatureB64");

                formData.Add(new StringContent(qrX), "qrX");

                formData.Add(new StringContent(qrY), "qrY");

                formData.Add(new StringContent(qrSize), "qrSize");

                formData.Add(new ByteArrayContent(File.ReadAllBytes(filePath)), "document", Path.GetFileName(filePath));

​

                var response = await client.PostAsync(ApiEndpoint, formData);

                response.EnsureSuccessStatusCode();

​

                var responseBody = await response.Content.ReadAsStringAsync();

​

                var jObject = JObject.Parse(responseBody);

                JToken documentUrlToken;

                if (jObject.TryGetValue("documentURL", out documentUrlToken))

                {

                    var documentUrl = documentUrlToken.Value<string>();

                    if (!string.IsNullOrEmpty(documentUrl))

                    {

                        var downloadPath = "downloaded_"+Path.GetFileName(filePath);

                        await DownloadDocumentAsync(client, documentUrl, downloadPath);

                        return downloadPath;

                    }

                }

​

                return null;

            }

        }

    }

​

    private static async Task DownloadDocumentAsync(HttpClient client, string documentUrl, string downloadPath)

    {

        using (var response = await client.GetAsync(documentUrl))

        {

            response.EnsureSuccessStatusCode();

            using (var fs = new FileStream(downloadPath, FileMode.Create))

            {

                await response.Content.CopyToAsync(fs);

            }

        }

    }

​

    public static void Main(string[] args)

    {

        var client = new IssueCredentialClient();

        var downloadedPath = client.IssueCredentialAsync("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6InNoYXJpZi5oYXNzYW5AaWVlZS5vcmciLCJwdWJLZXkiOiJ2VEFzeFdQNldRVWM4dGVPa2xHNGozalB1c3hla09qVlI0bm5nWGVNUDJFPSIsInNpZ25lZF9vbiI6IjIwMjMtMDktMTlUMDU6MDA6MTkuMTE0WiIsInVzZXJfdHlwZSI6Imlzc3VlciIsIm5hbWUiOiJJRUVFIiwidHlwZSI6ImFwaV90b2tlbiIsImlkIjoiNjRmODExMTcyOTk1ZTM1NWZmNWI4N2I0IiwiYWxsb3dlZF9uZXR3b3JrcyI6W10sImlhdCI6MTY5NTA5OTYxOX0.7AEgutuDE6w1ILN1IK4V8E-GRA2tvMdZeLAx8fX6ZYI", 

                                                         "testBatch", 

                                                         "{\"First Name\":\"BLPuserSS\",\"Program Name\":\"CDAC Certificate program\",\"Program Completion Date\":\"Mar 05 2023\",\"Certificate Number\":\"1181520553\"}", 

                                                         "6sNiihFpA/sBKsRPOddAN1t0mGl35ActQ2Oa8SBWWKg71wHKGMzcRm5aqWhUwyeNFmRUb+KjDD2Qkyz/MXOCCQ==", 

                                                         "521", 

                                                         "245", 

                                                         "100", 

                                                         "41279.pdf")

                                                         .Result;

        if (!string.IsNullOrEmpty(downloadedPath))

        {

            Console.WriteLine("Document downloaded to: " + downloadedPath);

        }

        else

        {

            Console.WriteLine("Failed to download document.");

        }

    }

}

​