Imports of XML data to marketplaces

You need to ensure the functionality of data importation: adding new supplier goods, updating balances and prices. Systemization: once a day updating balances and prices.
The vendor provides a direct link to the XML file, modeled after Yandex Market. All items for further placement on Ozone, Yandex Market, WB
I would also like to see all the goods have crossed out the price of the current (discount)