Server to Server App Authenticate Webhook

First time setting up an app to receive webhooks from Zoom and it seems I have it configured properly, but it is failing to validate. Using the Zoom header option.

This is just for testing but I am receiving the plaintext and returning the json according to the documentation. I can see it is hitting my app and generating everything.

secret token

and I return Ok and this

https… using ngrok to test from dev local build

I just realized the Hash I created from C# was using all capital letters so just had to fix that, now it works.