Validate a CFDI

Validate a CFDI 4.0 XML: structure, arithmetic, the digital seal (sello), and — when already stamped — live SAT status. Send either JSON { "xml_base64": "..." } or a raw CFDI XML body with Content-Type application/xml.

POST /v1/validations

Validate a CFDI

cURL

curl --request POST \
  --url https://api.newinvoice.dev/v1/validations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "xml_base64": "PGNmZGk6Q29tcHJvYmFudGUgLi4uLz4="
}
'

import requests

url = "https://api.newinvoice.dev/v1/validations"

payload = { "xml_base64": "PGNmZGk6Q29tcHJvYmFudGUgLi4uLz4=" }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({xml_base64: 'PGNmZGk6Q29tcHJvYmFudGUgLi4uLz4='})
};

fetch('https://api.newinvoice.dev/v1/validations', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.newinvoice.dev/v1/validations",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'xml_base64' => 'PGNmZGk6Q29tcHJvYmFudGUgLi4uLz4='
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.newinvoice.dev/v1/validations"

	payload := strings.NewReader("{\n  \"xml_base64\": \"PGNmZGk6Q29tcHJvYmFudGUgLi4uLz4=\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.newinvoice.dev/v1/validations")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"xml_base64\": \"PGNmZGk6Q29tcHJvYmFudGUgLi4uLz4=\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.newinvoice.dev/v1/validations")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"xml_base64\": \"PGNmZGk6Q29tcHJvYmFudGUgLi4uLz4=\"\n}"

response = http.request(request)
puts response.read_body

200

{
  "object": "validation",
  "id": "obj_2P9K3sample",
  "valid": true,
  "errors": [
    {
      "code": "string",
      "path": "string",
      "message": "string",
      "remediation": "string"
    }
  ],
  "summary": {
    "uuid": "5FB2822E-396D-4725-8521-CDC4BDD20CCF",
    "version": "string",
    "tipo_de_comprobante": "string",
    "emisor": "string",
    "receptor": "string",
    "moneda": "MXN",
    "sub_total": "string",
    "total": "116.00",
    "stamped": true,
    "sat": {
      "estado": "string",
      "es_cancelable": "string",
      "cancel_status": "none"
    }
  },
  "livemode": false,
  "created_at": "2026-07-10T18:25:43Z"
}

{
  "type": "https://errors.invoiceapi.mx/auth_unauthorized",
  "title": "Authentication required",
  "status": 401,
  "code": "auth.unauthorized",
  "detail": "Missing or invalid API key.",
  "remediation": "Send `Authorization: Bearer sk_test_...` (or sk_live_...) with a valid API key.",
  "doc_url": "/docs/errors#auth-unauthorized",
  "request_id": "req_2P9K3sample"
}

{
  "type": "https://errors.invoiceapi.mx/idempotency_key_reuse",
  "title": "Idempotency-Key reused with a different request body",
  "status": 409,
  "code": "idempotency.key_reuse",
  "detail": "This Idempotency-Key was already used for a different payload.",
  "remediation": "Reuse an Idempotency-Key only for byte-identical retries; use a fresh key otherwise.",
  "doc_url": "/docs/errors#idempotency-key_reuse",
  "request_id": "req_2P9K3sample"
}

{
  "type": "https://errors.invoiceapi.mx/request_validation_failed",
  "title": "Request validation failed",
  "status": 422,
  "code": "request.validation_failed",
  "detail": "One or more fields did not satisfy the schema.",
  "remediation": "Fix the fields listed in `errors` and resubmit.",
  "doc_url": "/docs/errors#request-validation_failed",
  "request_id": "req_2P9K3sample"
}

{
  "type": "https://errors.invoiceapi.mx/rate_limit_exceeded",
  "title": "Rate limit exceeded",
  "status": 429,
  "code": "rate_limit.exceeded",
  "detail": "Too many requests for this key + request class (reads and writes are limited separately).",
  "remediation": "Back off and retry after the number of seconds in the Retry-After header; batch work or lower your request rate.",
  "doc_url": "/docs/errors#rate_limit-exceeded",
  "request_id": "req_2P9K3sample"
}

{
  "type": "https://errors.invoiceapi.mx/internal_error",
  "title": "Internal server error",
  "status": 500,
  "code": "internal.error",
  "detail": "An unexpected error occurred.",
  "remediation": "Retry later; contact support with the request_id if it persists.",
  "doc_url": "/docs/errors#internal-error",
  "request_id": "req_2P9K3sample"
}

Authorizations

Authorization · string · header · required

API key: Authorization: Bearer sk_test_... or sk_live_....

Headers

Invoice-Version · string

Pin a dated API release (Stripe-style). Omit to use the current version. An unknown value returns 400 request.invalid_version. Echoed back on every response.

Example:

"2026-07-10"

Invoice-Account · string

Connect: act on behalf of one of your connected accounts (its acct_…/org_… id). Omit to act as your own organization. Not honored on /v1/api_keys.

Example:

"org_2P9connectedacct"

Idempotency-Key · string

Safely retry any POST. The first response is stored for 24h and replayed byte-for-byte for identical retries (the replay adds an idempotent-replayed: true header). Reusing the key with a different body is 409 idempotency.key_reuse; an in-flight duplicate is 409 idempotency.key_processing. This makes retrying a 502/429 safe — no duplicate stamp.

Example:

"a1b2c3d4-e5f6-4789-8abc-1234567890ab"

Body

application/json

xml_base64 · string · required

Base64 of the CFDI XML to validate (Content-Type application/json).

Minimum string length: 1

Response

200

application/json

Default Response

object · enum<string> · required

Always "validation".

Available options: validation

id · string · required

Validation record id.

valid · boolean · required

True when the CFDI passed all structural/SAT checks.

errors · object[] · required

The validation failures found (empty when valid).

Show child attributes

summary · object · required

Parsed summary of the CFDI plus SAT status.

Show child attributes

livemode · boolean · required

True if validated with a live-mode key.

created_at · string · required

Creation timestamp, ISO-8601 UTC.