Generate PDFs in C# and .NET

Prerequisites

• A PDFDesignAPI account and API token.
• A template UUID with a schema and at least one data binding.
• Trusted server-side code where the token remains secret.

Generate and save the PDF

using System.Net.Http.Headers;
using System.Net.Http.Json;

using var request = new HttpRequestMessage(
    HttpMethod.Post,
    $"https://pdfdesignapi.com/api/v1/generate/single/{templateUuid}");
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", apiToken);
request.Content = JsonContent.Create(new {
    data = new { customer = new { name = "Example BV" } }
});

using var response = await httpClient.SendAsync(
    request,
    HttpCompletionOption.ResponseHeadersRead,
    cancellationToken);
response.EnsureSuccessStatusCode();

await using var output = File.Create("document.pdf");
await response.Content.CopyToAsync(output, cancellationToken);

Production notes

• Reuse an injected HttpClient rather than constructing one per request in production.
• Pass cancellation tokens through the complete workflow.
• Inspect the error body before deciding whether a request is safe to retry.