ReadonlyactionOptional ReadonlyfieldsObject containing the Custom Fields fields for the RecurringOrder.
Required if at least one Custom Field is defined as required in the `fieldDefinitions` of the referenced [Type](ctp:api:type:Type).
Optional ReadonlytypeDefines the Type that extends the RecurringOrder with Custom Fields. If absent, any existing Type and Custom Fields are removed from the RecurringOrder.
Adding or updating a Custom Type on a Recurring Order generates the RecurringOrderCustomTypeSet Message, removing one generates the RecurringOrderCustomTypeRemoved Message.