curl --request POST \
  --url https://api.firma.dev/functions/v1/signing-request-api/workspaces/{id}/api-key/expire \
  --header 'Authorization: <api-key>'

{
  "success": true,
  "expired_keys": [
    {
      "id": "old-key-uuid",
      "api_key": "firma_old456...",
      "original_expires_at": "2024-12-18T10:30:00Z",
      "expired_at": "2024-12-17T10:30:00Z"
    }
  ],
  "workspace_id": "123e4567-e89b-12d3-a456-426614174000"
}