curl --request POST \
  --url https://api.example.com/api/Messages/Sms \
  --header 'Content-Type: application/json' \
  --data '
{
  "templateId": 123,
  "templateAttachmentIds": [
    123
  ],
  "entityTypeId": 123,
  "subject": "<string>",
  "body": "<string>",
  "placementId": 123,
  "changeRequestId": 123,
  "jobId": 123,
  "recipientIds": [
    123
  ],
  "ccRecipients": [
    "<string>"
  ],
  "sourceMessageId": 123,
  "documentLibraryAttachmentIds": [
    123
  ]
}
'