curl --request GET \
  --url https://api.zeckta.com/v1/messaging/sms/preview \
  --header 'Authorization: Bearer <token>'

{
  "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>"
  },
  "requestId": "<string>"
}