Starting from 05/07/2025, we will implement a change to the preference search endpoint: only those created within the last 90 days will be considered. Older preferences must be accessed using their ID through the corresponding endpoint. This change will be applied progressively and will be completed by 05/19/2025. For more details, visit the news.

Regularization of "external_reference" parameter in integrations

To avoid issues with transactions, update the "external_reference" parameter sent through the preferences and payments API before 10/10/2025. This field must be a maximum of 64 characters and may only contain numbers, letters, hyphens (-), and underscores (_). Special characters such as ([ ], (), ", @) are not allowed. See the documentation for more information.

Starting April 15, 2025, all requests that send URLs with the HTTP protocol in the back_urls field will be automatically cleaned by the API, resulting in empty entries in our database. This change is due to the risks associated with the HTTP protocol, which lacks encryption and allows access to sensitive data. The cleaning process will be gradual, so starting May 15, 2025, requests with HTTP URLs will be completely blocked. We invite all our integrators to review their configurations and switch to other accepted protocols.

Starting June 30th, versions of PHP below 8.2 will no longer receive security fixes or development support. To ensure WooCommerce stores are not affected and continue receiving new features from Mercado Pago, it is essential to keep your version updated by that date. To learn more about how to update PHP, please access this link.