Hi, if you use our free wp users integration, you can add to your login form a checkbox named “newsletter” and it should be intercepted, or you can configure the addon to grab every subscription. Of course if and only if the plugin you use triggers the standard WP events about the user registration.
Thanks for the fast replay, look like this plugin triggers not the standard. we have userintegration and all is active, in our old register form it was working well.
we do have only the option for customer fields with checkbox, but i do not know how it works really.
here a screen from settings we have onca.in /images /checkbox.png