Custom XML exchange within Magento

A default installation of Magento has a field called ‘Inventory’, which reports total available inventory that a business has on hand to fill customer orders. Since we have multiple warehouse locations, we need to count inventory by each location in addition to ‘total inventory’. To support this, we have created four custom product attributes to store the quantity of inventory at our four inventory locations which match those setup in our accounting system. We require an extension in Magento that will send a request to our accounting system, receive updated inventory counts in each location and then update our custom product attribute values. The script will be configurable using some options specified in the admin, under System > Configuration > Catalog > Inventory and will run under a CRON job. The script should log success/failures to a log file located on the Magento server and send email notifications as configured. (Note: the XML transaction at the accounting system is already built and tested. We require the Magento side of the transaction ONLY. This includes admin setup options, XML request by CRON, handle response, update database, write log, send email.) A detailed technical requirements document is available to selected bidders. Only bid of this project if you are: a) intimately familiar with Magento's technical complexities b) have completed at least 10 Magento projects before (through freelancer, which must be verifiable), one of which must relate to permissions resources c) have experience working with XML transactions d) can complete the work quickly There are many other projects available for the successful freelancer. REALISTIC PRICING ONLY PLEASE - WE KNOW HOW LONG THIS PROJECT SHOULD TAKE.