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Send the following request to register a webhook:
This will register the webhook, and check that the TargetUrl responds to a test POST. The TargetUrl must:
  • be HTTPS
  • have a valid TLS certificate.
  • respond 200 OK when it receives a POST with a test event.
When the event(s) happen (contact.changed for example), then the target URL is notified by HTTP POST using a message like the one shown here: