Is there a way to limit the use of a coupon by a customer ie one use per unique customer. I remember on WP that they has a system where the use of the coupon was restricted to one per email address. This system is not fool proof but at the moment customer can use the same coupon multiple time which defeats the object of a welcome back incentive and just cost us a lot of money in discounts. A single use unique barcode/number generated for the customer would be ideal. Many thanks
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