Fetch a Custom Object Instance by external_id.
Fetch a Custom Object Instance by external_id.
200
successful
401
Unauthorized
{ "id": "3", "type": "object_type_identifier_4", "custom_attributes": { }, "external_id": "123", "external_created_at": null, "external_updated_at": null, "created_at": 1713520877, "updated_at": 1713520877 }