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How Laravel Middleware and Redis Atomic Locks Prevent Duplicate API Charges

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Double-click errors on slow networks can cause transactional APIs to process identical requests twice, leading to duplicate charges or refunds. API idempotency addresses this by requiring clients to send a unique UUID header so the server can identify and reject repeat requests. In Laravel, a custom middleware intercepts incoming POST requests and uses Redis's atomic Cache::add() operation to check whether a given idempotency key has already been processed. If the key exists, the duplicate request is immediately aborted with a conflict response, preventing any double-processing. This approach makes transactional endpoints mathematically predictable and eliminates the manual overhead of correcting duplicate financial records.

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How Laravel Middleware and Redis Atomic Locks Prevent Duplicate API Charges · ShortSingh