Ecommerce multi-vendor script advice

I am interested in a script/ software which I can host on my server and offer a service where users act as vendors and can offer them a ready made online store by adding there own domain name or a option of a sub folder with my domain name. There stores will act as individual shops with there own designs on there own domain names.
They should have a WYSIWYG EDITOR with widgets they can drag and drop with full functioning cart and discount codes etc. Therefore needs to be very flexible for me…
Ecommerce multi-vendor script advice

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