Anyone using a Suitelet deployed Available Without Login for webhooks, etc? Asking for a friend

Yes

Yes

In a SuiteApp, or Account Customization?

AC

AC

No. Revisiting a web-hook solution that NetSuite do not endorse (and still doesn't).

We ended up moving several webhooks that used to go directly to Suitelets over to a Java service that queues the webhooks and then hits NS through Restlets. It's a bit more complex, but we found that it's much easier to troubleshoot issues and missing events.

Yes, I've built such 'Relays' in the past as well. Thanks @ericl