AI-generated Key Takeaways
- 
          UnitType defines the unit used for a reservation, and while often the same, it can differ from CostType, which is how an ad is billed. 
- 
          UnitType includes options such as impressions, clicks, various types of CPA conversions, viewable impressions, and in-target impressions. 
- 
          Certain UnitTypes, like clicks and viewable/in-target impressions, are supported only for specific LineItem types. 
- 
          CPA conversion UnitTypes (click-through, view-through, and total) are only supported as secondary goals and when the CostType is CPA. 
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
- 
               https://www.google.com/apis/ads/publisher/v202505
| 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. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |