Bitrix online store price update

There are price lists with articles and prices to them in xls format.
You only need to update prices by importing csv (make of available xls).
Youre not interested in manual upgrades.
There is already a customized import and an example of csv from the previous update (ID - retail price).
That is, to use it you need to be able to identify what article - what ID on the site, as the price xls only articles.
Third-party modules are unlikely to stand up, as Bitrix 2013 and there is no need to update it.

The price to offer.