You can password protect any booklet. This will require a customer to provide this password before they can view the content. The password works in all views of your booklet, from the landing page to embedded, emailed, and social links to your booklet.
To set a password for your booklet, go to the share tab and click settings.
Next, type in the password you would like a customer to use to view your booklet and click Set Password.
You can come back to this screen anytime and change the password. It will automatically update on all live versions of your booklet..