Developer fixes payment API timeouts using retry logic and idempotency keys

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A developer resolved an intermittent 30-second timeout issue in a client's ASP.NET Core API that called a third-party payment processor. The solution implemented a Polly retry policy with short, fixed delays to handle transient latency spikes. Idempotency keys were added to each payment request to prevent duplicate transactions during retries. Permanent failures were logged to a dead-letter queue for manual review instead of being discarded.

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