Possible optimization mode of a customer acquisition goal.
| Enums | |
|---|---|
| 
 | Not specified. | 
| 
 | Used for return value only. Represents value unknown in this version. | 
| 
 | The mode is used when campaign is optimizing equally for existing and new customers, which is the default value. | 
| 
 | The mode is used when campaign is bidding higher for new customers than existing customer. | 
| 
 | The mode is used when campaign is only optimizing for new customers. |