The dimensions and fiscal_data objects have been added to the items parameter of the Preferences API, where the dimensions of the item to be sent and its respective fiscal data will be presented.

We have rewritten some sections of the Tiendanube documentation to accommodate the new user experience on the payment configuration screens with Checkout Pro, Checkout API e Meses sin Tarjeta.
Consequently, it was also necessary to change some steps in the section for configuring discounts, installments, and fees.

The payment identifier field (payment_id), which currently accepts 11 digits (up to 99,999,999,999), will start accepting 12 digits (from 100,000,000,000 to 999,999,999,999). This change will occur in the coming weeks, so please review your integration if necessary to avoid transaction errors.

From now on, the user ID fields, which were previously of type Int32, have changed to the Int64 format. If your application uses this information through fields such as ‘user_id’, ‘payer_id’, ‘collector_id’, or any other reference to user IDs provided by Mercado Pago, your integration may generate errors if you do not make the necessary adjustments. See more details here.