Ask HN: Consuming one-shot webhooks reliably

Over the years I've worked on a few systems that need to consume one-shot webhooks.

For whatever reason, retries aren't available/practical and even then I've seen (and er, also written) bugs where the webhook was consumed incorrectly but we returned a 204 anyway; so even if retries were available we would never have seen one.

I've seen a few products for sending webhooks (e.g. Diahook, Gowebhooks) getting discussed over the past few weeks but not anything on the other receiving side. Building a HA webhook consumption system from scratch seems like reinventing the wheel for my current project and I was wondering if anyone has any strategies/products they could recommend?