curl --request GET \
  --url http://localhost:2222/v1/messaging/sms/previews

{
  "success": true,
  "message": "<string>",
  "data": {
    "src": "<string>",
    "dest": "<string>",
    "message": "<string>",
    "encoding": "<string>",
    "gsm7": true,
    "segments": 123,
    "messageLength": 123,
    "units": 123,
    "cost": 123,
    "priority": "<string>",
    "type": "<string>"
  }
}