Orders is now generally available as of Zuora Billing Release 284 (August 2020).
If you are an existing Zuora Subscribe and Amend customer and want to adopt Orders, see What is Orders Harmonization and join the Orders Harmonization community group for more information. If you want to enable Orders, submit a request at Zuora Global Support.
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.