The source of the synthetic content designation.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/synthetic_content_source.proto)

| Enums ||
|---|---|
| ## `ADVERTISER_ATTESTED` | Attestation provided by the advertiser. |
| ## `GOOGLE_GENERATED_ADVERTISER_REVIEWED` | Google-generated content with advertiser review or input. |
| ## `GOOGLE_GENERATED_FULLY_AUTOMATED` | Google-autogenerated content without advertiser review. |
| ## `UNKNOWN` | Used for return values only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |