API resource reference for ContactGroupMembership, part of the Notification service. To create or change one, see Changing resources; to inspect, see Reading resources.
Identity
Overview
AContactGroupMembership links a Contact to a ContactGroup, adding that contact as a member of the group. Use it when you want a contact to receive notifications sent to a group: create one membership per contact-to-group pairing. The membership references both the target ContactGroup and the Contact being added, and the controller tracks the sync of that membership to the underlying notification provider.