Developer fixes idempotency bug in Spring Boot e-commerce backend after reader query

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A developer fixed a flaw in the idempotency protection of their Spring Boot e-commerce project, ShopEase. The original implementation returned a conflict error for reused keys, even if the initial request succeeded but the client never received the response. This meant customers could not retrieve the results of a successful order after a network failure. The updated service now correctly replays the result of the original transaction for identical retries and rejects requests with mismatched payloads. The fix also includes concurrent request protection and explicit replay headers for client clarity.

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