I would like to send multiple products to paypal.
I know that the format of sending products to payPal is: 

```
 <input type="hidden" name="item_name_x" value="test 1">

```

Unfortunately, it doesn't work.
What do you think the problem is?

```html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
            <form action="https://www.paypal.com/cgi-bin/webscr" method="post">
                <input type="hidden" name="cmd" value="_xclick">
                <input type="hidden" name="business" value="ronny@hoojima.com">
                <input type="hidden" name="item_name_1" value="test 1">
                <input type="hidden" name="item_number_1" value="1">
                <input type="hidden" name="item_name_2" value="test 2">
                <input type="hidden" name="item_number_2" value="2">
                <input type="hidden" name="item_name_3" value="test 3">
                <input type="hidden" name="item_number_3" value="3">
                <input type="hidden" name="amount_1" value="99.00">
                <input type="hidden" name="amount_2" value="2">
                <input type="hidden" name="amount_3" value="99.00">
                <input type="image" name="submit" src="https://www.paypalobjects.com/webstatic/en_US/i/buttons/checkout-logo-large.png" alt="PayPal - The safer, easier way to pay online">
            </form>
</body>
</html>
```