code: func CreateWebhook(c *messagebird.Client, req *WebhookCreateRequest) (*Webhook, error) {
  	webhook := &Webhook{}
  	if err := request(c, webhook, http.MethodPost, webhooksPath, req); err != nil {
  		return nil, err
  	}
  
  	return webhook, nil
  }
docs: // CreateWebhook registers a webhook that is invoked when something interesting
  // happens.