Rotate an endpoint signing secret

{
  "id": "whe_6d21c9f0a3b7",
  "object": "webhook_endpoint",
  "url": "https://merchant.example.com/hooks/boundlesspay",
  "description": "Production ledger sync",
  "environment": "live",
  "enabled_events": [
    "transfer.completed",
    "transfer.failed",
    "deposit.settled"
  ],
  "status": "active",
  "consecutive_failures": 0,
  "last_success_at": "2026-08-30T09:15:02.441Z",
  "last_failure_at": null,
  "last_error": null,
  "created_at": "2026-07-04T11:02:19.006Z",
  "signing_secret": "whsec_5b7a20d3e9114f6c8d2a91fe4c30ab77"
}