How can a client change their billing cycle? Why is there no Billing Term section?

Clients can move a service to another billing cycle (for example monthly to annually) by themselves once you turn the feature on.

• Turn it on: Settings > General Settings > Ordering > Billing Term Change. It is off by default.
• What the client sees: a Billing Term section on the service page with the price of each other cycle. The new term starts with the next renewal invoice. Nothing is charged or credited when they ask, and they can cancel the change until it starts.
• No Billing Term section on a service? The service must be active, have a next due date, have no cancellation pending, and still be at the standard price of its product and options. A custom price or a location price is not offered a change, so change those by hand. A cycle is also hidden when Allow in signup is off for it on the product, or when the product has no price for it.
• A renewal invoice is already waiting: it stays on the current term. The new term starts with the invoice after it.

You can see and cancel a pending change on the service page in the admin portal. Read Billing Term Change.