I integrated the MC4WP plug in and have a subscribe option upon user registration, but is it possible to have two separate subscribe marks. So you can opt in to either the business newsletter or user newsletter etc?
Unfortunately, we are not very familiar with this service, so we cannot provide more details. But as far as we know, when you install this service and configure it, you will have one checkbox added to the registration form. As for the second checkbox, I recommend that you check their documentation or contact their support, as you will most likely need a custom implementation.