This is the concept which you can work with to build your custom coding:
/includes/modules/pages/checkout_confirmation/header_php.php
around line 44 you have:```
if (isset($_POST['payment'])) $_SESSION['payment'] = $_POST['payment'];
$_SESSION['comments'] = zen_db_prepare_input($_POST['comments']);
Add the check to enforce not-empty content:```
if (isset($_POST['payment'])) $_SESSION['payment'] = $_POST['payment'];
$_SESSION['comments'] = zen_db_prepare_input($_POST['comments']);
[B]if ($_SESSION['comments'] == '') {
$messageStack->add('checkout_payment', 'Please enter order comments before proceeding.', 'error');
zen_redirect(zen_href_link(FILENAME_CHECKOUT_PAYMENT, '', 'SSL'));
}[/B]
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