How to prevent customers from booking themselves twice into one class

By default, Momence allows customers book themselves into class more than once. You can turn this setting off from Settings > General Setup.

Scroll to Misc. account settings > toggle on 'Limit classes to 1 booking per customer.'

After toggling on the setting above, a customer that books a class will still see the normal confirmation message like this.

However, if they attempt to book the same class again later on, they'll see this.