Actions.xml

<?xml version="1.0" encoding="utf-8"?>
<actions>
  <action intentName="actions.intent.TAKE_COURSE">
    <parameter name="course">
      <entity-set-reference
            entityType="org.schematype.Course"
            urlFilter="https://www.course.org/*">
      </entity-set-reference>
    </parameter>
    <fulfillment urlTemplates="{url}?referrer=actions-on-google-previous"/>
  </action>
</actions>