curl --request PUT \
  --url https://api.atendai.com/api/schedules/{scheduleId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contactId": "<string>",
  "sendAt": "2023-11-07T05:31:56Z",
  "userId": "<string>",
  "flow": [
    {
      "content": "<string>",
      "delay": "<string>",
      "fileName": "<string>"
    }
  ],
  "flowId": "<string>"
}
'

{
  "message": "<success message>"
}