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create-idempotency-handler

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Generates Idempotency Handler for PHP 8.4. Creates PSR-15 middleware with Redis-backed deduplication, IdempotencyKey value object, and storage interface. Includes unit tests.

skills/create-idempotency-handler/SKILL.md

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# Idempotency Handler Generator

Creates idempotency handling infrastructure for safe request deduplication.

## When to Use

| Scenario | Example |
|----------|---------|
| Payment processing | Prevent duplicate charges on retry |
| Order creation | Avoid duplicate orders from network retries |
| Webhook handling | Deduplicate incoming webhook deliveries |
| API mutations | Ensure POST/PUT/PATCH safety on retry |

## Component Characteristics
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