Hello! I've set up a webhoook. When I test the subscription, I get a 403. The same request works when I use Postman. I'm not yet performing a security check against the X-HubSpot-Signature header, so the endpoint should be wide open.
I saw another topic (Webhook test returning 500 Error) where it was suggested that HubSpot webhooks may have problems with wildcard certificates (which we are using)--is that a problem?