A great way to improve your shop: send an automatic email to users who haven't completed the order to ask them for the reason. How you can benefit from it: You will be able to recover most of the orders not completed by your customers; You will know if there is a common reason for not completing the orders so to correct possible errors or gaps in the purchasing process; You will have the possibility to encourage users to complete their order by sending them a coupon valid for the purchase.