e-commersce multi-store solution?

Hello,

I run and administer 12 e-commerce for my clients. Currently I'm using wordpess and joomla plug-ins to admin the shopping carts and keep track of inventory and orders. This is really getting out of hand.

I'm looking for a CMS eCommerce platform that will allow me to transfer ALL the stores to one common admin panel. Something like Shopify or Bigcommerce software. I also need to be able to add-on more clients in the future.

Two things I really need is that users have to be able to…

e-commersce multi-store solution?