MailUp for WooCommerce allows you to add a newsletter subscription flag in the checkout form, so that the user can give his consent at the same time as the order.
In the plugin settings, it is possible to decide whether to send the user the confirmation of registration provided by MailUp, as well as to choose the list and any MailUp group to which to add the user.
In the settings of each WooCommerce product there is a meta box that allows you to specify a list and a possible MailUp group.
If we have enabled this feature for the WordPress post type we are editing, we will find at the bottom of the page a series of options useful for creating a MailUp subscription button.
The plugin allows you to create MailUp subscription buttons to use where most needed on your WordPress site.
With MailUp for WooCommerce you can ask the user to subscribe to the newsletter at the same time as registering on your website.