5. To sync all of your existing clients, check option "Sync All Clients". (Make sure that you have your clients opt-in permission).
6. Clients booking online will be able to opt-in and subscribe to your mailing list when the option "Enable email opt-in option for online bookings" is checked.
6.1 If "The email opt-in option is ticked by default" option is checked, the Opt-in sign up label will be ticked by default at the time of booking.
6.2 If the double opt-in option is checked, clients are not signed up immediately to the mailing list. MailChimp will email clients asking them to confirm their subscription. Learn more about double opt-in process here.
6.3 You can edit the Opt-in Label by entering text that your clients will have to tick if they want to be added to your mailing list.
7. Click "Save". It might take up to 10 minutes to sync all of your BookSteam clients to your MailChimp list (depending on the number of clients).