Rotate the signing secret

Issues a new whsec_... secret, returned once in this response. The old secret remains valid for 24 hours — deliveries carry two v1= signature entries during this dual-signature window so consumers can migrate without dropped verifications. Rotation is audit-logged.

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Path Params
string
required
Headers
string
length ≤ 255

Any unique string (e.g. a UUID). Retries with the same key within 24h return the original response with Idempotent-Replayed: true. Same key + different body → 409.

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