curl --request GET \
  --url https://api.spikelabs.com/v1/users/external/{external_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "user_abc123",
  "object": "user",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "external_id": "<string>",
  "metadata": {},
  "settings": {
    "memory_enabled": true
  }
}