Retrieve campaign KPIs
Authentication
Path parameters
UUID of the campaign (see GET /api/campaigns). A non-UUID is a 400; a well-formed id that is
unknown or belongs to another workspace returns zero-valued general KPIs, not a 404.
Query parameters
Look-back window in days. Never rejected - a non-integer, out-of-range (1-365) or non-numeric value falls back to 30.

