Changes to Creates a new webhook.

deleted the header request parameter Authorization

the endpoint scheme security oauth2 was added to the API

api operation id PostWebhook removed and replaced with webhooks_PostWebhook

the authenticationType request property's minLength was increased from 0 to 1

the events request property's minLength was increased from 0 to 1

the name request property's minLength was increased from 0 to 1

the uri request property's minLength was increased from 0 to 1