‘MercadoPagoException’ с сообщением ‘атрибутомaction_amount не может быть нулевым

Я получаю ошибку

Я хочу реализовать платежный шлюз, но ошибка очень похожа на:

Недопустимое смещение строки ‘code’

Недопустимое смещение строки «описание»

‘MercadoPagoException’ с сообщением ‘атрибутомaction_amount не может быть нулевым

Это мой массив

$preference_data = array(
"items" => array(
array(
"id" => "Code",
"title" => $rest['name'],
"currency_id" => "USD",
"picture_url" =>"https://www.mercadopago.com/org-img/MP3/home/logomp3.gif",
"description" => "Description",
"category_id" => "Category",
"quantity" => 1,
"unit_price" => intval($total_price)
)
),
"payer" => array(
"name" => "APRO".$a[0],
"surname" => $a[1],
"email" => "[email protected]",
"date_created" => "2014-07-28T09:50:37.521-04:00",
"phone" => array(
"area_code" => "11",
"number" => "4444-4444"),
"identification" => array(
"type" => "DNI",
"number" => "12345678"),
"address" => array(
"street_name" => "Street",
"street_number" => 123,
"zip_code" => "1430")
),
"back_urls" => array(
"success" => "http://localhost/duncan_fooddelivery/api/success.php",
"failure" => "http://www.failure.com",
"pending" => "http://www.pending.com"),
"auto_return" => "approved",
"payment_methods" => array(
"excluded_payment_methods" => array(
array(
"id" => "amex",
)
),
"excluded_payment_types" => array(
array(
"id" => "ticket")
),
"installments" => 24,
"default_payment_method_id" => null,
"default_installments" => null,
),
"shipments" => array(
"receiver_address" => array(
"zip_code" => "1430",
"street_number"=> 123,
"street_name"=> "Street",
"floor"=> 4,
"apartment"=> "C")
),
"token" => array (
"card_id" => NULL,
"card_number_length" => 16,
"cardholder" => array (
"identification" => array (
"number" => "11111111",
"type" => "DNI",
),
"name" => "APROARPAN BAJPAI",
),
"creation_date" => NULL,
"due_date" => NULL,
"esc" => NULL,
"expiration_month" => 6,
"expiration_year" => 2022,
"first_six_digits" => "450995",
"id" => "ad56c2e6cb4a2b17c18e632139366a7e",
"last_four_digits" => "3704",
"last_modified_date" => NULL,
"luhn_validation" => "true",
"public_key" => "TEST-1a0ffe62-165f-4e7b-b501-df15741b6d87",
"security_code_length" => 3,
"status" => "active",
"trunc_card_number" => NULL,
"used_date" => NULL,
),
"transaction_amount" => 60,
"notification_url" => "https://www.your-site.com/ipn",
"external_reference" => "Reference_1234",
"expires" => false,
"expiration_date_from" => null,
"expiration_date_to" => null,
);

Я передаю «action_amount «=> 60, но все равно получаю ту же ошибку.

Пожалуйста, помогите мне, я ищу с 5 часов.

Благодарю.