entityId property
Numerical identifier of the client entity.
The entity can be an advertiser, a brand, or an agency. This identifier is unique among all the entities with the same type. The value of this field is ignored if the entity type is not provided. A list of all known advertisers with their identifiers is available in the advertisers.txt file. A list of all known brands with their identifiers is available in the brands.txt file. A list of all known agencies with their identifiers is available in the agencies.txt file.
Implementation
core.String? entityId;