Ya logre lo que buscaba :)
Código PHP:
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"id" => "item-ID-1234",
"title" => "Multicolor kite",
"quantity" => 1,
"currency_id" => "ARS", // Available currencies at: https://api.mercadopago.com/currencies
"picture_url" => "https://www.mercadopago.com/org-img/MP3/home/logomp3.gif",
"description" => "Item description",
"category_id" => "art", // Available categories at https://api.mercadopago.com/item_categories
"unit_price" => 10.00
);
"name" => "user-name",
"surname" => "user-surname",
"date_created" => "2015-06-02T12:58:41.425-04:00",
"area_code" => "11",
"number" => "4444-4444"
),
"identification" => array( "type" => "DNI",
"number" => "12345678"
),
"street_name" => "Street",
"street_number" => 123,
"zip_code" => "5700"
)
);
$items [] = $item;
$payers [] = $payer;
"items" => $items,
"payer" => $payers
);