List a contact's activity
Returns the campaigns that targeted the contact and the delivery, engagement and unsubscribe events recorded against them, newest first. Send meta.nextCursor back as before to read the next page; a null cursor means the timeline is exhausted. meta.retentionDays is how long tracking events are kept, so anything older is simply not there. A contact id that does not resolve within the organization yields a 404. Requires the contacts: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.