Documentation

URL Parameters

Tracking URLs can carry parameters that identify the click, campaign context, advertising platform macros, and customer-defined tokens.

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Common parameters

redirection_url — declared next-hop destination for transparent Google tracking
gclid, gbraid, wbraid — Google click identifiers when present
campaignid, adgroupid, creative, device, matchtype, keyword — Google Ads macros when present
Traffic-source and custom campaign tokens configured by the customer
Cost parameters when configured for a traffic source
fl_click_id — FourLook-owned click correlation parameter appended to destinations in transparent modes

redirection_url is required.
It must be an absolute HTTPS URL.
Double-encoded absolute URLs, localhost, IP hosts, and unsafe characters are rejected.