In POSTMAN while sending post request to create webhook, it returned with 400 bad request.

Failed to validate the notification URL 'https://ngrokfrwdURL.ngrok.io/api/spwebhook/handlerequest

<?xml version="1.0" encoding="utf-8"?> <m:error xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
    <m:code>-1, System.InvalidOperationException</m:code>
    <m:message xml:lang="en-US">Failed to validate the notification URL 'https://ngrokURL.ngrok.io/api/spwebhook/handlerequest'.</m:message> </m:error>
  • Keep your web application active during this process – guest1 Jan 30 '20 at 4:23

Rather I would suggest use this tool to create subscriptions for your desired list/library:

SharePoint Framework web part to manage Webhooks

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