Optional ReadonlykeysTrusted v1a public keys: parsed keys or their whpk_ form, normally the result of
WebhookKeyCache.keys(). Never taken from the request.
Optional ReadonlynowThe own clock, Unix milliseconds; default Date.now.
Optional ReadonlysecretsTrusted v1 secrets: their whsec_ form or the raw key bytes.
Optional ReadonlytoleranceLargest distance of webhook-timestamp to VerifyWebhookTrust.now in milliseconds;
default webhook.receiver_tolerance.
What verifyWebhook needs besides the request.