I am trying to update pricing using the Soap V2 interface. This is the XML structure I am sending as my Soap request:
<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:Magento" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
<soapenv:Header/>
<soapenv:Body>
<urn:catalogProductAttributeTierPriceUpdate soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<sessionId>xxxxxxxx</sessionId>
<product xsi:type="xsd:string">486</product>
<tier_price>
<customer_group_id>1</customer_group_id>
<qty>1</qty>
<price>10.44</price>
<website>base</website>
</tier_price>
</urn:catalogProductAttributeTierPriceUpdate>
</soapenv:Body>
</soapenv:Envelope>
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