2000 requests per month based on client identifier (using service class identifier)

quota_sample6.xml

<Quota name="QuotaPolicy">
    <Interval>1</Interval>
    <TimeUnit>month</TimeUnit>
    <Allow count="2000">
        <Class ref="request.header.clientId">
            <Allow class="X" count="100"/>
            <Allow class="Y" count="75" />
            <Allow class="_default" count="50" />
        </Class>
    </Allow>
</Quota>