curl --request GET \
  --url http://localhost:3001/api/admin/subscription-groups/

[
  {
    "id": "<string>",
    "workspaceId": "<string>",
    "name": "<string>",
    "channel": "Email",
    "type": "OptIn",
    "createdAt": 123,
    "updatedAt": 123
  }
]