How to display product ID on product page?

Hi @kcsaba22,

This wouldn’t be related to the Storefront theme and you would need to insert the post ID data into the template files output of the main WooCommerce plugin itself by using and add_action() function.

https://developer.www.ads-software.com/reference/functions/add_action/

You could then use the WordPress get_the_ID() function to display the post id.

https://developer.www.ads-software.com/reference/functions/get_the_id/