<?xml version="1.0" encoding="utf-8"?>
<request method="invoice.create">
    <invoice>
        <client_id>1</client_id>
        <lines>
            <line>
                <name>Test line 1</name>
                <unit_cost>1</unit_cost>
                <quantity>1</quantity>
            </line>
            <line>
                <name>Test line 2</name>
                <unit_cost>2</unit_cost>
                <quantity>2</quantity>
            </line>
        </lines>
    </invoice>
</request>