Custom Meta Boxes - WP

$meta_boxes[] = array(
    'id' => 'coupon',
    'title' => 'Offer Code',
    'pages' => array('post', 'link'), // multiple post types, accept custom post types
    'context' => 'normal', // normal, advanced, side (optional)
    'priority' => 'high', // high, low (optional)
    'fields' => array(
            array(
            'name' => 'Offer Code',
            'desc' => 'Enter offer code text here',
            'id' => $prefix . 'code',
            'type' => 'textarea' // text area
        ),
        array(
            'name' => 'Expiration Date',
            'desc' => 'Enter date here (Month 01, 2011)',
            'id' => $prefix . 'expidate',
            'type' => 'text'