Resources/config/services.xml
<?xml version="1.0" ?>
<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">
<parameters>
<parameter key="coderbyheart.mailchimp.api.class">Coderbyheart\MailChimpBundle\MailChimp\Api</parameter>
</parameters>
<services>
<service id="mailchimp" class="%coderbyheart.mailchimp.api.class%">
<argument>%coderbyheart_mail_chimp.api_key%</argument>
<call method="setReturnType">
<argument>%coderbyheart_mail_chimp.return_type%</argument>
</call>
</service>
</services>
</container>