I've released 1.0.10 today of the core component. It's honestly a bit of Kluge because as far as I know there is no built support for UPC,EAN or ISBN universal codes. So to accomplish this I contemplated using Virtuemart product types and product descriptions. Product description won out. To use this feature you need to do a few extra steps...

1. Type in a UPC, EAN or ISBN into your product description. It doesn't matter where within the description. However it does need to be the same product description (long/short) that you have chosen to include in your product feed (check your redmystic configuration settings). The Format must also to be one of the following:

             UPC#XXXXX#

             EAN#XXXXX#

             ISBN#XXXXX#

where XXXXX is the actual universal code. Please also take care to make sure the redmystic configuration setting "INCLUDE_UNIVERSAL_PRODUCT_ID" is set to "Yes"