Sent when a customer Storage recording export fails terminally. Uses the same signed envelope and retry contract as other meeting webhooks. Applies to recordings exported to customer Storage buckets.
Signature header t=<unix-seconds>,v1=<hex>. Compute HMAC-SHA256 with the webhook secret over the timestamp ASCII bytes, a literal . byte, and the exact raw request-body bytes; hex-encode and compare v1 in constant time. Reject timestamps outside your accepted skew. No bearer token is sent.