Marketing
type: Marketing platform type (e.g., "ga", "pixel")
source: Traffic source (e.g., "google", "facebook", "newsletter") - equivalent to utm_source
campaign: Marketing campaign name or identifier - equivalent to utm_campaign
medium: Marketing medium (e.g., "cpc", "email", "social", "banner") - equivalent to utm_medium
content: Specific content or ad variant identifier - equivalent to utm_content
term: Search term or keyword that triggered the visit - equivalent to utm_term
url: Full URL that brought the user to the site
referrer: HTTP referrer URL from the previous page