As I understand, the Glide webhook actions sends a password and a unique event ID in the header.
In addition to using an HTTPS endpoint the client (receiver) should check for the correct password and if the event ID is unique.
For additional security others suggest using HMAC-based signatures, (see e.g. here: How to Secure Webhooks. 5-Step Checklist - Hookdeck)
Is there a way to implement HMAC somehow in Glide?