OPC for Virtuemart 3 and Virtuemart 2 comes with custom built product XML feeds which allow you to export your products and it's attributes (custom fields) into Google Merchant RSS Feed, Heureka.cz, Heureka.sk, Ceneo.pl and other price comparing or aggregator companies. OPC supports 2 ways of generating the feeds - either manually via visiting OPC Export section and clicking create the feed where you can configure a default number of products (batch) which will be exported at once to be able to proceed with your memory and timeout limits or via CRON's CLI support where you can run the script directly which will export the products without any timeout other limits. Each aggregator uses it's own taxonomy for category export so they can pair your products into their own category system. OPC Export comes with custom tab plugin which displayes the 3rd party category taxonomy within your Virtuemart category backend management.
Print Screens of OPC 3.0.316
Video Installation Guide