You can configure notifications for each of your applications directly from Your integrations efficiently and securely. In this section, we will explain how to:

1. Indicate the notification URLs and configure events
2. Validate the origin of a notification
3. Simulate receiving a notification

To configure Webhook notifications, it is necessary to indicate the URLs to which they will be sent.

To do this, follow the step-by-step instructions below:

1. Go to Your integrations and select the application integrated with Checkout Pro for which you want to activate notifications.

2. In the left menu, select Webhooks > Configure Notifications and configure the URL that will be used to receive them.

3. Select the Production mode tab and provide an HTTPS URL to receive notifications with your production integration.

4. Select the Payments event to receive notifications, which will be sent in JSON format via an HTTPS POST to the URL specified earlier.

5. Finally, click on Save configuration. This will generate a secret key exclusive to the application, which will allow you to validate the authenticity of the received notifications, ensuring they were sent by Mercado Pago. Note that this generated key does not have an expiration date and its periodic renewal is not mandatory, although it is recommended. To do this, simply click the Reset button.

To ensure that notifications are configured correctly, it is necessary to simulate their reception. Follow the steps below to perform the simulation:

1. After configuring the URLs and Events, click Save configuration.
2. Next, click Simulate to test whether the specified URL is receiving notifications correctly.
3. On the simulation screen, select the URL to be tested, which can be either the test URL or the production URL.
4. Then, choose the event type and enter the ID that will be sent in the notification body (Data ID).
5. Finally, click Send test to verify the request, the response provided by the server, and the event description. You will receive a response similar to the example below, which represents the body of the notification received on your server.

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{
  "action": "payment.updated",
  "api_version": "v1",
  "data": {
    "id": "123456"
  },
  "date_created": "2021-11-01T02:02:02Z",
  "id": "123456",
  "live_mode": false,
  "type": "payment",
  "user_id": 724484980
}

Validating the origin of a notification is fundamental to ensuring the security and authenticity of the received information. This process helps prevent fraud and guarantees that only legitimate notifications are processed.

Mercado Pago will send a notification to your server similar to the example below for an alert with the topic payment. In this example, the complete notification is included, containing the query params, the body, and the header of the notification.

• Query params: These are query parameters that accompany the URL. In the example, we have data.id=123456 and type=payment.
• Body: The body of the notification contains detailed information about the event, such as action, api_version, data, date_created, id, live_mode, type, and user_id.
• Header: The header contains important metadata, including the secret signature of the notification x-signature.

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POST /test?data.id=123456&type=payment HTTP/1.1
Host: prueba.requestcatcher.com
Accept: */*
Accept-Encoding: *
Connection: keep-alive
Content-Length: 177
Content-Type: application/json
Newrelic: eyJ2IjpbMCwxXSwiZCI6eyJ0eSI6IkFwcCIsImFjIjoiOTg5NTg2IiwiYXAiOiI5NjA2MzYwOTQiLCJ0eCI6IjU3ZjI4YzNjOWE2ODNlZDYiLCJ0ciI6IjY0NjA0OTM3OWI1ZjA3MzMyZDdhZmQxMjEyM2I5YWE4IiwicHIiOjAuNzk3ODc0LCJzYSI6ZmFsc2UsInRpIjoxNzQyNTA1NjM4Njg0LCJ0ayI6IjE3MDk3MDcifX0=
Traceparent: 00-646049379b5f07332d7afd12123b9aa8-e7f77a41f687aecd-00
Tracestate: 1709707@nr=0-0-989586-960636094-e7f77a41f687aecd-57f28c3c9a683ed6-0-0.797874-1742505638684
User-Agent: restclient-node/4.15.3
X-Request-Id: bb56a2f1-6aae-46ac-982e-9dcd3581d08e
X-Rest-Pool-Name: /services/webhooks.js
X-Retry: 0
X-Signature: ts=1742505638683,v1=ced36ab6d33566bb1e16c125819b8d840d6b8ef136b0b9127c76064466f5229b
X-Socket-Timeout: 22000
{"action":"payment.updated","api_version":"v1","data":{"id":"123456"},"date_created":"2021-11-01T02:02:02Z","id":"123456","live_mode":false,"type":"payment","user_id":724484980}

From the received Webhook notification, you will be able to validate the authenticity of its origin. Mercado Pago will always include the secret key in the Webhook notifications that will be received, allowing you to validate their authenticity. This key will be sent in the x-signature header, which will be similar to the example below.

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`ts=1742505638683,v1=ced36ab6d33566bb1e16c125819b8d840d6b8ef136b0b9127c76064466f5229b`

To confirm the validation, it is necessary to extract the key from the header and compare it with the key provided for your application in Your integrations.

Follow one of the approaches below to validate the authenticity of the notification.

<?php
use MercadoPago\Webhook\WebhookSignatureValidator;
use MercadoPago\Exceptions\InvalidWebhookSignatureException;

try {
    WebhookSignatureValidator::validate(
        $_SERVER['HTTP_X_SIGNATURE'],
        $_SERVER['HTTP_X_REQUEST_ID'],
        $_GET['data_id'],
        $secret
    );
    http_response_code(200);
} catch (InvalidWebhookSignatureException $e) {
    http_response_code(401);
}

import { WebhookSignatureValidator, InvalidWebhookSignatureError } from 'mercadopago';

try {
    WebhookSignatureValidator.validate({
        xSignature: req.headers['x-signature'],
        xRequestId: req.headers['x-request-id'],
        dataId:     req.query['data.id'],
        secret,
    });
    res.sendStatus(200);
} catch (err) {
    if (err instanceof InvalidWebhookSignatureError) res.status(401).end();
    else throw err;
}

from mercadopago.webhook import WebhookSignatureValidator, InvalidWebhookSignatureError

try:
    WebhookSignatureValidator.validate(
        request.headers.get(“x-signature”),
        request.headers.get(“x-request-id”),
        request.args.get(“data.id”),
        secret,
    )
    return “”, 200
except InvalidWebhookSignatureError:
    return “”, 401

import “github.com/mercadopago/sdk-go/pkg/webhook”

err := webhook.ValidateSignature(
    r.Header.Get(“x-signature”),
    r.Header.Get(“x-request-id”),
    r.URL.Query().Get(“data.id”),
    secret,
)
if err != nil {
    w.WriteHeader(http.StatusUnauthorized)
    return
}
w.WriteHeader(http.StatusOK)

using MercadoPago.Error;
using MercadoPago.Webhook;

try {
    WebhookSignatureValidator.Validate(
        xSignature: Request.Headers[“x-signature”],
        xRequestId: Request.Headers[“x-request-id”],
        dataId:     Request.Query[“data.id”],
        secret:     secret);
    return Ok();
} catch (InvalidWebhookSignatureException) {
    return Unauthorized();
}

import com.mercadopago.webhook.WebhookSignatureValidator;
import com.mercadopago.exceptions.MPInvalidWebhookSignatureException;

try {
    WebhookSignatureValidator.validate(
        request.getHeader(“x-signature”),
        request.getHeader(“x-request-id”),
        request.getParameter(“data.id”),
        secret);
    response.setStatus(200);
} catch (MPInvalidWebhookSignatureException e) {
    response.setStatus(401);
}

require 'mercadopago/webhook/validator'

begin
    Mercadopago::Webhook::Validator.validate(
        request.headers['x-signature'],
        request.headers['x-request-id'],
        request.params['data.id'],
        secret
    )
    head :ok
rescue Mercadopago::Webhook::InvalidWebhookSignatureError
    head :unauthorized
end

During the process of creating preferences, it is possible to configure the notification URL more specifically for each payment using the notification_url field.

Below, we explain how to configure notifications when creating a payment using our SDKs.

1. In the notification_url field, specify the URL from which notifications will be received, as shown below.

<?php
$client = new PreferenceClient();
$preference = $client->create([
  "notification_url" => "https://www.your_url_to_notification.com/",
  "items"=> array(
    array(
      "title" => "Mi producto",
      "quantity" => 1,
      "unit_price" => 2000
    )
  )
]);

echo $preference
?>

const preference = new Preference(client);

preference.create({
  body: {
    notification_url: 'https://www.your_url_to_notification.com/',
    items: [
      {
        title: 'Mi producto',
        quantity: 1,
        unit_price: 2000
      }
    ],
  }
})
.then(console.log)
.catch(console.log);

PreferenceItemRequest itemRequest =
       PreferenceItemRequest.builder()
           .id("1234")
           .title("Games")
           .description("PS5")
           .pictureUrl("http://picture.com/PS5")
           .categoryId("games")
           .quantity(2)
           .currencyId("BRL")
           .unitPrice(new BigDecimal("4000"))
           .build();
   List<PreferenceItemRequest> items = new ArrayList<>();
   items.add(itemRequest);
PreferenceRequest preferenceRequest = PreferenceRequest.builder()
.items(items).build();
PreferenceClient client = new PreferenceClient();
Preference preference = client.create(request);

# Crea un objeto de preferencia
preference_data = {
  notification_url: 'https://www.your_url_to_notification.com/',
  items: [
    {
      title: 'Mi producto',
      unit_price: 75.56,
      quantity: 1
    }
  ]
}
preference_response = sdk.preference.create(preference_data)
preference = preference_response[:response]

# Este valor reemplazará el string "<%= @preference_id %>" en tu HTML
@preference_id = preference['id']

// Crea el objeto de request de la preference
var request = new PreferenceRequest
{
    Items = new List<PreferenceItemRequest>
    {
        new PreferenceItemRequest
        {
            Title = "Mi producto",
            Quantity = 1,
            CurrencyId = "ARS",
            UnitPrice = 75.56m,
        },
    },
};

// Crea la preferencia usando el client
var client = new PreferenceClient();
Preference preference = await client.CreateAsync(request);

# Crea un ítem en la preferencia
preference_data = {
    "notification_url" : "https://www.your_url_to_notification.com/",
    "items": [
        {
            "title": "Mi producto",
            "quantity": 1,
            "unit_price": 75.76,
        }
    ]
}

preference_response = sdk.preference().create(preference_data)
preference = preference_response["response"]

client := preference.NewClient(cfg)

request := preference.Request{
	Items: []preference.ItemRequest{
		{
			Title:       "My product",
			Quantity:    1,
			UnitPrice:   75.76,
		},
	},
}

resource, err := client.Create(context.Background(), request)
if err != nil {
	fmt.Println(err)
	return
}

fmt.Println(resource)

2. Implement the notification receiver using the following code as an example:

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<?php
 MercadoPago\SDK::setAccessToken("ENV_ACCESS_TOKEN");
 switch($_POST["type"]) {
     case "payment":
         $payment = MercadoPago\Payment::find_by_id($_POST["data"]["id"]);
         break;
     case "plan":
         $plan = MercadoPago\Plan::find_by_id($_POST["data"]["id"]);
         break;
     case "subscription":
         $plan = MercadoPago\Subscription::find_by_id($_POST["data"]["id"]);
         break;
     case "invoice":
         $plan = MercadoPago\Invoice::find_by_id($_POST["data"]["id"]);
         break;
     case "point_integration_wh":
         // $_POST contiene la informaciòn relacionada a la notificaciòn.
         break;
 }
?>

After performing the necessary configuration, the Webhook notification will be sent in JSON format. Below you can see an example of a notification for the payment topic, and the descriptions of the information sent in the table below.

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{
 "id": 12345,
 "live_mode": true,
 "type": "payment",
 "date_created": "2015-03-25T10:04:58.396-04:00",
 "user_id": 44444,
 "api_version": "v1",
 "action": "payment.created",
 "data": {
     "id": "999999999"
 }
}