-dropshipping -customer service(email and chat) -tracking of orders (follow-up with sellers) -order cancelation, return, exchange and refund -dropshipping -customer service(email and chat) -tracking of orders (follow-up with sellers) -order cancelation, return, exchange and refund -dropshipping -customer service(email and chat) -tracking of orders (follow-up with sellers) -order cancelation, return, exchange and refund