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Open fix: prevent duplicate charges on payment retry #482

wants to merge 2 commits into main from fix/retry-idempotency

src/payments/retry.ts ···

41  const order = await getOrder(input.orderId)
42-  const charge = await capturePayment(order)
43-  await rememberKey(input.key)
42+  await claimKey(input.key)
43+  const charge = await capturePayment(order)
44  await settle(order, charge)

eblan[bot] just now

⚠ Race condition — capturePayment runs before the idempotency key is recorded. Two concurrent retries can both reach the capture call and double-charge the customer. Record the key atomically before capturing:

Suggested fix

await claimKey(input.key)
const charge = await capturePayment(order)

Reviewed in 94s 1 blocking issue · 2 suggestions · approved with comments

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// eblan · review pipeline
const review = await claude.review({
  diff: pr.changedFiles(),
  context: [
    "src/payments/retry.ts",
    "src/payments/keys.ts",
    "docs/conventions.md",
  ],
  style: repo.conventions(),
});

// → 1 blocking issue · 2 suggestions
// → posted to the PR in 94s

“Eblan caught a race condition in our payment flow that three engineers had walked right past. It paid for itself in a single pull request.”

Dana Whitfield · CTO, Fieldnote — beta user

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