Get campaign recipient metrics
Counts the people a campaign reached rather than the messages it sent: each person is counted once across every channel, which is why these figures differ from the per-channel counters on the campaign statistics endpoint. A figure that could not be measured is returned as null rather than 0, and coversFullRange is false when the requested range starts before the event retention window. An unresolvable audience yields nulls rather than an error. Requires the campaigns:read scope.
Authorizations
An organization API key, prefixed bk_live_. Takes precedence over Authorization when both are sent. The key is bound to one organization, and the scopes it was issued with are enforced per endpoint.
Headers
Required when authenticating with an access token. Optional with an API key, whose own organization binding is authoritative; a value contradicting it is refused with 403.