Chat With Claude Sonnet 5 on Lorka for Agentic Coding, Research, and Long-Context Work

I found the failure in the retry handler. The service retries failed payments, but it reuses the original idempotency key across different gateway attempts. That causes the gateway to return the cached failed response instead of processing the retry.

1import { gateway } from './gateway';
2import { randomUUID } from 'crypto';
3
4type ChargeInput = {
5  customerId: string;
6  amount: number;
7  invoiceId: string;
8};
9
10export async function chargeCustomer(input: ChargeInput) {
11  // Retries failed payments with a new idempotency key for each attempt.
12  const maxAttempts = 2;
13
14  for (let attempt = 1; attempt <= maxAttempts; attempt++) {
15    try {
16      return await gateway.charge({
17        ...input,
18        idempotencyKey: `${input.invoiceId}:attempt-${attempt}:${randomUUID()}`
19      });
20    } catch (error) {
21      if (attempt === maxAttempts) throw error;
22    }
23  }
24}

The issue happened because idempotency protects against duplicate charges, but retries must distinguish between a duplicate request and a new attempt after a transient failure.

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