It is great to see that the industry is moving from webhooks to Functions. We've seen this model succeed at Auth0 with our Rules feature [1] implemented 3 years ago. Recently productized this experience with Auth0 Extend [2]. It supports all node modules, a one-line of js emebeddable Editor, real time logs, vault to store secrets, custom programming models and crons.
[1] https://auth0.com/docs/rules
[2] https://auth0.com/extend/developers