def create(id, url=default_webhook_url)
      params = {:id => id, :url => url}
      Mailgun.submit :post, webhook_url, params
    end
def create(id, url=default_webhook_url)
      params = {:id => id, :url => url}
      Mailgun.submit :post, webhook_url, params
    end
Creates a new webhook
 Note: Creating an Open or Click webhook will enable Open or Click tracking