Not able to verify the endpoint of the webhook only App in zoom

I have created a webhook type in in zoom and trying to validate the endpoint as shown in the document below. But I am not able to get the verification done.

The URL that I am trying to validate :

Hashing code :

String signature = EncodingUtil.base64Encode(Crypto.generateMac(‘HmacSHA256’, Blob.valueOf(plaintoken), Blob.valueOf(csecret)));

Reference documentation:

How To Reproduce
Click the validate button from the webhook only app.

Hi @sysadminabc
Thanks for reaching out to the Zoom Developer Forum and sorry for the late reply.
Have you been able to validate your endpoint URL ?