Subscription periods are the periods of time your customers can subscribe for services. For the clean installation the default subscription periods set is one month, a quarter, half a year, and one year.
You can delete any of default subscription periods and add as many custom subscription periods as you need.
By default all subscription periods are enabled for selling. You can select what periods to sell per hosting plan, during creation or under the Billing Rates of a hosting plan properties. Subscription period duration is multiple of a month.
To add a new subscription period: