Intégrer FacturX API avec .NET

using var client = new HttpClient
{
    BaseAddress = new Uri("https://api.facturxapi.com")
};
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", Environment.GetEnvironmentVariable("FACTURX_API_KEY"));

using var form = new MultipartFormDataContent();
form.Add(new StreamContent(File.OpenRead("Invoices/FX-2024-0001.pdf")), "file", "FX-2024-0001.pdf");
form.Add(new StringContent("fr"), "lang");

var response = await client.PostAsync("/api/v1/validate", form);
var payload = await response.Content.ReadFromJsonAsync<FacturxReport>();

if (payload is { Valid: false })
{
    logger.LogWarning("FacturX errors {@Errors}", payload.Errors);
}

Checklist intégration

• ✓

  Réutiliser HttpClient (DI) pour éviter l'épuisement des sockets

• ✓

  Ajouter Polly (WaitAndRetry) sur 429/502

• ✓

  Logguer request_id via ILogger pour support