src/Resources/config/services.xml
<?xml version="1.0" encoding="UTF-8"?>
<container xmlns="http://symfony.com/schema/dic/services" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
<service id="core23_piwik.client.factory" class="Core23\PiwikBundle\Client\ClientFactory">
<argument type="service" id="core23_piwik.http.client"/>
<argument type="service" id="core23_piwik.http.message_factory"/>
</service>
</services>
</container>