Opencart module for loading/unloading of goods in xml format

you want to develop a module for Opencart v 2.1.0.1 (a reference to Russian build skeen), and Your version of the Russian Assembly.
Implementation of the process of loading/unloading of goods in xml format (xml will provide).
The module should be generic and work with different xml
When you upload a new xml to the website:
when the coincidence position is to do nothing
when matching of prices is to do nothing
the different prices – update prices
when new positions to add them
in the absence of the old position – the position to leave and notify the admin in their absence (I think it is possible directly in a window on the website at the time of download)
Accordingly on the website, after download you can see a catalog with products, prices, photos and descriptions.
Term 1 – 2 days. Payment webmoney.