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# Idempotency Key
- URL: https://www.adlingo.org/glossary/idempotency-key/
- Published: 2025-01-15T10:47:00.000Z
- Updated: 2025-01-15T10:47:00.000Z
- Description: A unique key attached to each request that changes data, so a repeated request has the same effect as the original and does not create duplicates.
- Author: Travis Lusk
- Tags: Agentic Advertising, #glossary, #Import 2026-10-27 17:05

The "don't book it twice" safeguard. Networks hiccup. Agents retry. A retried request could book the same $100K buy a second time. The key lets the system spot the repeat and ignore it. Unsexy, but essential.