Magento advanced config.xml example: extensibility alpha-1

config.xml

<?xml version="1.0"?>
<global>
  <events>
    <customer_delete_commit_after>
      <observers>
        <customer_deleted_event>
          <class>Mage_Customer_Model_Customer_Webhook_Observer</class>
          <method>dispatchCustomerDeletedEvent</method>
        </customer_deleted_event>
      </observers>
    </customer_delete_commit_after>
    </events>
    <webhook>
      <webhooks>
        <customer>
          <deleted>
            <label>Customer Deleted</label>
            <type>inform</type>
          </deleted>
        </customer>
      </webhooks>
      <formats>
        <json>
          <label>JSON</label>
            <options>
              <default_formatter>Mage_Webhook_Model_Formatter_Json</default_formatter>
            </options>
            <formatter_factory>Mage_Webhook_Model_Formatter_Factory_Json</formatter_factory>
        </json>
      </formats>
      <subscribers>
        <my_subscriber>
          <version>1.4</version>
          <name>Test subscriber</name>
          <endpoint_url>https://mage.loc/mage-twitter-integration/web/index.php/endpoint</endpoint_url>
          <topics>
            <customer>
              <created/>
              <updated/>
              <deleted/>
            </customer>
            <order>
              <created/>
            </order>
          </topics>
      </subscriber_id>
    </subscribers>
  </webhook>
</global>