If you are an existing Zuora Subscribe and Amend customer, we recommend you enable Orders Harmonization to access the Orders feature. With Orders, you can access both existing functions for subscription and billing management and the new features on Zuora Billing.
The Orders and related objects are mapped between Zuora and Zuora Quotes via the Zuora REST API.
New Subscription Mapping
The following diagram depicts the mapping between new subscription quotes in Salesforce and the orders in Zuora via the Order REST API.