If you enable the Inventory Control setting for a product, you can specify how many units of that product can be sold thru your E-junkie cart before the product becomes unavailable. If you happen to oversell a product, just email your buyer to inform them that you are out of stock and offer to either send the item when it is available again or just send a refund for that item. There is no way to directly synchronize your E-junkie product configs here with a database on your end, but you may be able to program something at your end that can take advantage of our integration instructions:
http://www.e-junkie.com/ej/help.integration.php
