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<?xml version="1.0" encoding="UTF-8"?>
<myxml>
    ...
    <stock>
        <stockdate></stockdate>
        <stockdescription></stockdescription>
        <stockamount></stockamount>
        <productid></productid>
    </stock>
</myxml>

stockdate
Date in YYYY-MM-DD format to identify moment of update.

stockdescription
Descriptive text. Defaults to "Update via Acumulus API".

stockamount
Amount to deduct or add to stock/availability. Use negative numbers for deductions. Allows for 2 digits.

productid Mandatory
Product identifier for which the availability needs to be updated.

stockamount
Actual amount stock/availability.

productid Mandatory
Product identifier for which the stock is applicable