Buttondown Documentation
Represents the original provenance of a subscriber. This value is not exposed to subscribers; it's only used for internal tracking purposes and governs some of the behavior of the subscriber (i.e. whether or not to require double opt-in.)
Subscriber created by API.
This subscriber was imported from another service.
This subscriber subscribed to your newsletter of their own volition.
This subscriber was added by a member of Buttondown support staff.
This subscriber was added by a user with write permissions for subscribers within the Buttondown dashboard.