curl --request POST \
  --url https://karibu.briq.tz/v1/message/send-instant \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "content": "<string>",
  "recipients": [
    "<string>"
  ],
  "sender_id": "<string>"
}
'

{
  "success": true,
  "job_id": "<string>",
  "status": "<string>",
  "message": "<string>",
  "stats": {
    "recipients": 123,
    "sms_parts": 123,
    "total_sms": 123,
    "cost": 123
  },
  "meta": {
    "http_code": 123,
    "internal_code": "<string>",
    "description": "<string>"
  }
}