Third-party impression tracking URLs support a number of macros which can be dynamically updated by the ad server during delivery.
CAMPAIGN_IDThe numerical ID of the campaign; e.g., 884461.
STATION_NAMEThe name of program
IPThe IP address of the device.
USERAGENTThe User-Agent header of the device.
CACHEBUSTERA random string for cache busting.
RANDOMA random string for cache busting.
TIMESTAMPUnix timestamp in seconds.