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Zen Cart automatically adds product numbers to each of your products. Here's some super easy ways to make those numbers more visible.
Add this code to includes/templates/YOUR_TEMPLATE/templates/tpl_product_info_display.php wherever you like (we chose right under the title, line 62)
ID: <?php echo $_GET['products_id']; ?><br />
in includes/modules/meta_tags.php
Find line 275
define('META_TAG_TITLE', str_replace('"','',$review_on . $meta_products_name . $meta_products_price . PRIMARY_SECTION . TITLE . TAGLINE));
and replace it with
$meta_products_name .= " ID: " . $product_info_metatags->fields['products_id']; define('META_TAG_TITLE', str_replace('"','',$review_on . $meta_products_name . $meta_products_price . PRIMARY_SECTION . TITLE . TAGLINE));