Our customer's have the option to opt-in to join our mailing list when checking out or creating an account. Based on tutorial video, it seems that after checking this box, Nexternal will automatically push "updated customer..information" every 10 minutes to MailChimp. Does this mean that every 10 minutes, any customers who have opted-in will automatically be added our mailing list in MailChimp? 3. If a customer unsubscribes to our newsletter via the "unsubscribe" link in an email, will the customer's file in Nexternal be updated as well? Meaning, will the "Mailing List" check-box be un-checked in their customer file?