curl --request GET \
  --url https://api.example.com/remnawave/users/{telegram_id}/traffic \
  --header 'X-API-Key: <api-key>'

{
  "used_traffic_bytes": 123,
  "used_traffic_gb": 123,
  "lifetime_used_traffic_bytes": 123,
  "lifetime_used_traffic_gb": 123,
  "traffic_limit_bytes": 123,
  "traffic_limit_gb": 123,
  "telegram_id": 123,
  "subscription_url": "<string>"
}