Upsert DataExensionObject via SOAP

upsert-dataextension-object-soap.xml

<?xml version="1.0" encoding="UTF-8"?>
<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
    <s:Header>
        <a:Action s:mustUnderstand="1">Create</a:Action>
        <a:To s:mustUnderstand="1">{{soapEndpoint}}</a:To>
        <fueloauth xmlns="http://exacttarget.com">{{accessToken}}</fueloauth>
    </s:Header>
    <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
        <UpdateRequest xmlns="http://exacttarget.com/wsdl/partnerAPI">
            <Options>
                <SaveOptions>
                    <SaveOption>
                        <PropertyName>*</PropertyName>
                        <SaveAction>UpdateAdd</SaveAction>
                    </SaveOption>
                </SaveOptions>
            </Options>
            <Objects xsi:type="DataExtensionObject">
                <PartnerKey xsi:nil="true" />
                <ObjectID xsi:nil="true" />
                <CustomerKey>ExampleMaster</CustomerKey>
                <Properties>
                    <Property>
                        <Name>SubscriberKey</Name>
                        <Value>1234567890</Value>
                    </Property>
                    <Property>
                        <Name>EmailAddress</Name>
                        <Value>test@example.com</Value>
                    </Property>
                    <Property>
                        <Name>FirstName</Name>
                        <Value>Test</Value>
                    </Property>
                    <Property>
                        <Name>LastName</Name>
                        <Value>Example</Value>
                    </Property>
                </Properties>
            </Objects>
        </UpdateRequest>
    </s:Body>
</s:Envelope>