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⚡solution.py

from dataclasses import dataclass

@dataclass
class Submission:
  id: str
  status: str

def from_csv_row(row: str) -> Submission:
  id, raw_status = row.split(",")
  status = "passed" if raw_status == "AC" else "failed"
  return Submission(id=id, status=status)

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fix: resolve race condition in payment webhook

main ← fix/webhook-retry

services/payment_handler.py

42 def handle_webhook(self, event):

43- payment = self.process(event.data)

43+ with self._lock:

44+ payment = self.process(event.data)

45 return PaymentResult(payment)

Your review comment

The lock prevents concurrent webhook processing, but consider using an idempotency key instead for better throughput.

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