™2 min read
Definition
An idempotency key is a unique value you send on a write. The server records the first result against the key and replays it for any repeat, so a network-timeout retry of a POST cannot double-act. Reusing a key with a different body is an error.
In plain terms
A token that makes a retry safe by guaranteeing the action happens at most once.
Why it matters here
Essential for reliable writes on the partner ring. See idempotency and safe retries.
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