How to validate this array in Laravel?

Client send data in JSON format to server:

{
"Product": [{
    "quantity": 4,
    "id": 1
}]
}

On the server I tried to validate incoming data using this rule:

"Product" => "required|array",
"Product.*.id" => "integer",
"Product.*.quantity" => "integer"

Why does it not validate? Where is my mistake?

via Chebli Mohamed