{
  "id": "sup_01j5k...",
  "account_id": "acc_01j5k...",
  "external_supplier_id": "SUP-001",
  "code": "BEST-FOODS",
  "name": "Best Foods Co.",
  "email": "orders@bestfoods.com",
  "phone": null,
  "tax_id": "12-3456789",
  "is_active": true,
  "metadata": {},
  "created_at": "2026-08-07T14:30:00.000Z",
  "updated_at": "2026-08-07T14:30:00.000Z"
}

{
  "error": {
    "kind": "supplier_external_id_conflict",
    "message": "A supplier with this external_supplier_id already exists"
  }
}