La API para certificar emisores ante el SII.

$ API=https://api.enrolamiento.cl/v1/caf
$ RUT=11111111-1
$ curl -X POST -u '<usuario>:<apikey>' \
    --url-query ambiente=0 \
    "$API/$RUT/estado-folios/33/1001/1100"

const api = "https://api.enrolamiento.cl/v1/caf";
const auth = btoa("<usuario>:<apikey>");
const res = await fetch(
  `${api}/11111111-1/estado-folios/33/1001/1100?ambiente=0`,
  {
    method: "POST",
    headers: { Authorization: `Basic ${auth}` },
  }
);
const folios = await res.json();

import requests

api = "https://api.enrolamiento.cl/v1/caf"
r = requests.post(
    f"{api}/11111111-1/estado-folios/33/1001/1100",
    params={"ambiente": 0},
    auth=("<usuario>", "<apikey>"),
)
folios = r.json()

var api = "https://api.enrolamiento.cl/v1/caf";
var auth = Convert.ToBase64String(
    Encoding.UTF8.GetBytes("<usuario>:<apikey>"));
using var http = new HttpClient();
http.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Basic", auth);
var res = await http.PostAsync(
    $"{api}/11111111-1/estado-folios/33/1001/1100?ambiente=0",
    null);
var folios = await res.Content.ReadAsStringAsync();

$api = "https://api.enrolamiento.cl/v1/caf";
$url = "$api/11111111-1/estado-folios/33/1001/1100";
$ch = curl_init("$url?ambiente=0");
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_USERPWD => "<usuario>:<apikey>",
    CURLOPT_RETURNTRANSFER => true,
]);
$folios = json_decode(curl_exec($ch), true);

{
  "Rut": "11111111-1",
  "TipoDocumento": 33,
  "FolioInicial": 1001,
  "FolioFinal": 1100,
  "Disponibles": 60,
  "Utilizados": 38,
  "Anulados": 2
}