res = client.transformations.schedules.retrieve(id=1)

res = client.transformations.schedules.retrieve(external_id="1")
res = client.transformations.schedules.retrieve_multiple(ids=[1, 2, 3])

res = client.transformations.schedules.retrieve_multiple(external_ids=["t1", "t2"])

{
  "items": [
    {
      "id": 123,
      "externalId": "<string>",
      "createdTime": 123,
      "lastUpdatedTime": 123,
      "interval": "0 0 * * *",
      "isPaused": true
    }
  ]
}