Publisher Object

This object describes the publisher of the media in which the ad will be displayed. The publisher is
typically the seller in an OpenRTB transaction.

Attribute	Type	Description
id	string	Exchange-specific publisher ID.
name	string	Publisher name (may be aliased at the publisher’s request).
cat	string array	Array of IAB content categories that describe the publisher.
domain	string	Highest level domain of the publisher (e.g., “publisher.com”).
ext	object	Placeholder for exchange-specific extensions to OpenRTB.