AI-generated Key Takeaways
- 
          Customer acquisition goals can be optimized in different modes, including targeting all customers equally, bidding higher for new customers, or targeting only new customers. 
- 
          The default optimization mode for customer acquisition campaigns is to target all customers equally. 
- 
          There are also unspecified and unknown modes for customer acquisition goal optimization. 
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. |