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    Create a Webhook Subscription
    This section describes how to create a webhook subscription using the REST API.
The request you send is dependent on your system's security policy:
- Mutual trust (default)
- Mutual trust andOAuth
- Mutual trust andOAuth with JWT
The Webhooks REST API uses the mutual trust security policy by default. In addition to
            mutual trust, you can also use the OAuth or OAuth JWT security policy. If you are not
            using OAuth security to authenticate your webhook notifications, use the default mutual
            trust request.