AI-generated Key Takeaways
- 
          Defines the user identifier source for offline Store Sales, click conversion, and conversion adjustment uploads. 
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          User identifier sources can be unspecified, unknown, first-party (advertiser provided), or third-party (partner provided). 
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          FIRST_PARTYindicates the identifier came from the advertiser, andTHIRD_PARTYindicates it came from a partner.
The type of user identifier source for offline Store Sales, click conversion, and conversion adjustment uploads.
| Enums | |
|---|---|
| 
 | Not specified. | 
| 
 | Used for return value only. Represents value unknown in this version | 
| 
 | Indicates that the user identifier was provided by the first party (advertiser). | 
| 
 | Indicates that the user identifier was provided by the third party (partner). |