¿Migras de PAC? Utiliza stampxml

curl -sS -X POST "$FD_API/invoice/stampxml" \
  -H "X-Api-Key: $FD_API_KEY" \
  --data-urlencode "xmlbase64=$(base64 < factura-sellada.xml | tr -d '\n')"

<?php
$xml = file_get_contents('factura-sellada.xml');

$ch = curl_init(getenv('FD_API') . '/invoice/stampxml');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['X-Api-Key: ' . getenv('FD_API_KEY')],
    CURLOPT_POSTFIELDS => http_build_query(['xmlbase64' => base64_encode($xml)]),
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT => 120,
]);
$r = json_decode(curl_exec($ch), true);
echo $r['code'], ' ', $r['cfdi']['UUID'] ?? $r['message'], PHP_EOL;

import { readFile } from "node:fs/promises";

const xml = await readFile("factura-sellada.xml");
const res = await fetch(`${process.env.FD_API}/invoice/stampxml`, {
  method: "POST",
  headers: { "X-Api-Key": process.env.FD_API_KEY },
  body: new URLSearchParams({ xmlbase64: xml.toString("base64") }),
  signal: AbortSignal.timeout(120_000),
});
const r = await res.json();
console.log(r.code, r.cfdi?.UUID ?? r.message);

import base64, os, requests

with open("factura-sellada.xml", "rb") as f:
    xml = f.read()

r = requests.post(
    f"{os.environ['FD_API']}/invoice/stampxml",
    headers={"X-Api-Key": os.environ["FD_API_KEY"]},
    data={"xmlbase64": base64.b64encode(xml).decode()},
    timeout=120,
)
print(r.json())

var xml = await File.ReadAllBytesAsync("factura-sellada.xml");

using var http = new HttpClient { Timeout = TimeSpan.FromSeconds(120) };
http.DefaultRequestHeaders.Add("X-Api-Key", Environment.GetEnvironmentVariable("FD_API_KEY"));

var body = new FormUrlEncodedContent(new Dictionary<string, string> {
    ["xmlbase64"] = Convert.ToBase64String(xml),
});
var res = await http.PostAsync($"{Environment.GetEnvironmentVariable("FD_API")}/invoice/stampxml", body);
Console.WriteLine(await res.Content.ReadAsStringAsync());

{
  "message": "XML stamped successfully",
  "code": 200,
  "cfdi": {
    "UUID": "6F0C2E1A-9B3D-4C7E-8A51-2D4F6B8C0E13",
    "FechaTimbrado": "2026-11-04T10:15:30",
    "NoCertificado": "30001000000500003416",
    "SelloCFD": "Q2V4...Zm9vYmFy",
    "NoCertificadoSAT": "30001000000500003456",
    "SelloSAT": "Tm9w...ZGF0YQ==",
    "RfcProvCertif": "AAA010101AAA",
    "CadenaOrigTFD": "||1.1|6F0C2E1A-9B3D-4C7E-8A51-2D4F6B8C0E13|2026-11-04T10:15:30|…||",
    "CadenaQR": "https://verificacfdi.facturaelectronica.sat.gob.mx/default.aspx?id=6F0C2E1A-…",
    "XmlBase64": "PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4..."
  }
}