curl --request PATCH \
  --url https://api.example.com/v1/campaigns/{id} \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "description": "<string>",
  "daily_send_limit": 123,
  "delay_between_emails": 123,
  "sending_timezone": "<string>",
  "send_on_weekends": true,
  "track_opens": true,
  "track_clicks": true,
  "show_unsubscribe": true
}
'

{
  "data": {
    "campaign": {}
  }
}