X (Twitter) API C# follower export to CSV & XLSX

using System;
using System.IO;
using System.Text.Json;
using System.Threading.Tasks;
using XTwitterScraper;
using XTwitterScraper.Core;
using XTwitterScraper.Models.Extractions;

XTwitterScraperClient client = new();

string targetUsername = "username";
ExtractionEstimateCostResponse estimate = await client.Extractions.EstimateCost(
    new ExtractionEstimateCostParams
    {
        ToolType = ExtractionEstimateCostParamsToolType.FollowerExplorer,
        TargetUsername = targetUsername,
    }
);

if (!estimate.Allowed)
{
    throw new InvalidOperationException("Insufficient credits for follower export.");
}

ExtractionRunResponse job = await client.Extractions.Run(
    new ExtractionRunParams
    {
        ToolType = ExtractionRunParamsToolType.FollowerExplorer,
        TargetUsername = targetUsername,
    }
);

while (true)
{
    ExtractionRetrieveResponse statusPage = await client.Extractions.Retrieve(
        job.ID,
        new ExtractionRetrieveParams { Limit = 1 }
    );

    string? status = statusPage.Job.TryGetValue("status", out JsonElement statusValue)
        ? statusValue.GetString()
        : null;

    if (status == "completed")
    {
        break;
    }

    if (status == "failed")
    {
        throw new InvalidOperationException("Follower export failed.");
    }

    await Task.Delay(TimeSpan.FromSeconds(10));
}

string? cursor = null;
using StreamWriter writer = File.CreateText("xquik-followers.jsonl");

do
{
    ExtractionRetrieveResponse page = await client.Extractions.Retrieve(
        job.ID,
        new ExtractionRetrieveParams { Cursor = cursor, Limit = 1000 }
    );

    foreach (var follower in page.Results)
    {
        await writer.WriteLineAsync(JsonSerializer.Serialize(follower));
    }

    cursor = page.HasMore ? page.NextCursor : null;
} while (!string.IsNullOrEmpty(cursor));

using HttpResponse csvResponse = await client.Extractions.ExportResults(
    job.ID,
    new ExtractionExportResultsParams { Format = Format.Csv }
);
await File.WriteAllTextAsync("xquik-followers.csv", await csvResponse.ReadAsString());

using HttpResponse jsonResponse = await client.Extractions.ExportResults(
    job.ID,
    new ExtractionExportResultsParams { Format = Format.Json }
);
await File.WriteAllTextAsync("xquik-followers.json", await jsonResponse.ReadAsString());

using HttpResponse xlsxResponse = await client.Extractions.ExportResults(
    job.ID,
    new ExtractionExportResultsParams { Format = Format.Xlsx }
);
using Stream xlsxStream = await xlsxResponse.ReadAsStream();
using FileStream xlsxFile = File.Create("xquik-followers.xlsx");
await xlsxStream.CopyToAsync(xlsxFile);