Add comments sugestion on shipping products email

I would like to suggest to comment products ordered on the shipping products email, but i can't add product_id on the link url



file : shipment_products.tpl

You have to create variable langage : $lang.product_comment_email





{$lang.product_comment_email}: 


{foreach from=$shipment.items key=“hash” item=“amount”}

{if $amount > 0}

http://XXXXXXXX/shop/index.php?dispatch=products.view&product_id=$product.product_id`&selected_section=discussion"}">{$order_info.items.$hash.product},  

{/if}

{/foreach}





Anyone can help me please?



Bests