curl --request POST \
  --url https://api.example.com/miniapp/subscription/traffic \
  --header 'Content-Type: application/json' \
  --data '
{
  "initData": "<string>",
  "subscription_id": 123,
  "traffic": 123,
  "traffic_gb": 123
}
'

{
  "success": true,
  "message": "<string>"
}