{
  "id": 1340404,
  "title": "Title of what you are paying for. It will be displayed in the payment process.",
  "description": "Item description",
  "category_id": "art",
  "picture_url": "https://www.mercadopago.com/org-img/MP3/home/logomp3.gif",
  "currency_id": "ARS",
  "quantity": 1,
  "unit_price": 100
}