Similar use-case as @aubreypwd above. Need to test Webhooks from payment gateways such as PayPal, Stripe, Authorize.net etc and various other API’s which provide no way to authenticate when making the request.
Perhaps a customizable parameter that could be appended to the live-link might work in my case (not sure about Jetpack though) where the live-links authentication was disabled if this secret parameter was set in the URI.