Delete a Litmos User via the API

Delete a Litmos user via the API when the UI shows "<username> was pull and created via an integration. Please remove from master system." Use GET /users?source=Litmos to find the user Id, then DELETE /users/{userId}?source=Litmos; deleting is permanent so deactivate instead if data must be retained. Questions this answers: How can I delete users in bulk? How do I delete a user that was created by the ADP integration? Should I deactivate or delete a user I no longer need?