curl --request GET \
  --url https://core-proxy-service-w34nvoxnwq-uc.a.run.app/proxy_api/v1/iproyal/users/{user_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": 12345,
  "username": "<string>",
  "password": "<string>",
  "availableTraffic": 123,
  "usedTraffic": 123
}