Idempotency
An operation that can be repeated without changing the outcome.
Official source: RFC 9110 — HTTP Semantics →
HTTP normalises it as *idempotent methods*: a method is idempotent when the intended effect on the server of several identical requests equals that of a single one; PUT, DELETE and the safe methods qualify. The standard defines the adjective, not the noun. It is what makes a retry safe — a webhook delivered twice should not book the order twice.
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