get
https://e-{networkId}.adzerk.net/udb/{networkId}/interest/i.gif?userKey=&interest=
Interests are also called Flight Categories. To see what Interests have already been created in the system, you'll want to use the List Network Categories Endpoint or List Flight Categories Endpoint.
Note that the user key supplied in the
userobject will override a user key set via theazkcookie.