The type of optimization goal
| Enums | |
|---|---|
| 
 | Not specified. | 
| 
 | Used as a return value only. Represents value unknown in this version. | 
| 
 | Optimize for call clicks. Call click conversions are times people selected 'Call' to contact a store after viewing an ad. | 
| 
 | Optimize for driving directions. Driving directions conversions are times people selected 'Get directions' to navigate to a store after viewing an ad. | 
| 
 | Optimize for pre-registration. Pre-registration conversions are the number of pre-registration signups to receive a notification when the app is released. |