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title: Idempotency
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> **Idempotency** = `"required"` \| `"optional"` \| `"none"`

Defined in: [src/core/client.ts:12](https://github.com/slingshot/brex/blob/9dff46b5d5637a0dd072bca56d02d8a0f4425312/src/core/client.ts#L12)

Whether the operation's spec declares an Idempotency-Key header, and if it's required.