AI-generated Key Takeaways
- 
          UnitType indicates the type of unit used for defining a reservation, which can differ from the CostType. 
- 
          UnitType can refer to impressions, clicks, or various types of CPA conversions. 
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          Some UnitTypes, like CLICK_THROUGH_CPA_CONVERSIONS and VIEW_THROUGH_CPA_CONVERSIONS, are only supported as secondary goals and require the CostType to be CPA. 
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          Viewable and in-target impressions are UnitTypes supported by STANDARD line items. 
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          COMPLETED_VIEWS are supported only for standard reservation video line items. 
Indicates the type of unit used for defining a reservation. The CostType can differ from the UnitType - an ad can have an impression goal, but be billed by its click. Usually CostType and UnitType will refer to the same unit.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| IMPRESSIONS | The number of impressions served by creatives associated with the line
                item. Line items of all LineItemType support this UnitType. | 
| CLICKS | The number of clicks reported by creatives associated with the line item. The LineItem.lineItemType must be LineItemType.STANDARD, LineItemType.BULK or LineItemType.PRICE_PRIORITY. | 
| CLICK_THROUGH_CPA_CONVERSIONS | The number of click-through Cost-Per-Action (CPA) conversions from creatives associated with the line item. This is only supported as secondary goal and the LineItem.costType must be CostType.CPA. | 
| VIEW_THROUGH_CPA_CONVERSIONS | The number of view-through Cost-Per-Action (CPA) conversions from creatives associated with the line item. This is only supported as secondary goal and the LineItem.costType must be CostType.CPA. | 
| TOTAL_CPA_CONVERSIONS | The number of total Cost-Per-Action (CPA) conversions from creatives associated with the line item. This is only supported as secondary goal and the LineItem.costType must be CostType.CPA. | 
| VIEWABLE_IMPRESSIONS | The number of viewable impressions reported by creatives associated with the line item. The LineItem.lineItemType must be LineItemType.STANDARD. | 
| IN_TARGET_IMPRESSIONS | The number of in-target impressions reported by third party measurements. The LineItem.lineItemType must be LineItemType.STANDARD. | 
| COMPLETED_VIEWS | The number of completed views reported by creatives associated with the line item. A completed view is defined as having watched the entirety of the in-stream video ad and is only supported for standard reservation video line items. The LineItem.lineItemType must be LineItemType.STANDARD. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |