Customer Service Database Are There Any E-commerce Services Like Shopify/Yahoo Merchants That Include A Customer Registration Feature?

Are there any E-commerce services like Shopify/Yahoo Merchants that include a customer registration feature? - customer service database

Merchant Shopify shops and Yahoo both offer an integrated component of Web site hosting and commerce shopping cart, but both lack any kind of customer database / record account, based on tests, so that we can make sure to follow, better customer support for customers in the View past orders, etc..

Looking for something like Shopify / Yahoo Stores (integrated hosting service + shopping), but contain a customer account feature.