applications/accounting/servicedef/services_sample.xml

<?xml version="1.0" encoding="UTF-8"?>
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<services xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="https://ofbiz.apache.org/dtds/services.xsd">
    <description>Accounting Sample Services</description>
    <vendor>OFBiz</vendor>
    <version>1.0</version>

    <service name="sampleInvoiceAffiliateCommission" engine="groovy" auth="true"
        location="component://accounting/src/main/groovy/org/apache/ofbiz/accounting/invoice/SampleServices.groovy" invoke="sampleCalculateAffiliateCommission">
        <description>
            A sample/example service to calculate an affiliate commission (direct relationship to customer) and create
            and invoice for it on behalf of the affiliate, ie an invoice from the affiliate to the company that can
            then be paid by the company to balance it.
        </description>
        <attribute name="paymentId" type="String" mode="IN"/>
        <attribute name="invoiceIds" type="List" mode="OUT"/>
    </service>
</services>