AI-generated Key Takeaways
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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 | |
|---|---|
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                Not specified. | 
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                Used for return value only. Represents value unknown in this version | 
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                Indicates that the user identifier was provided by the first party (advertiser). | 
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                Indicates that the user identifier was provided by the third party (partner). |