Want to restrict a coupon to one single customer?
This is what Coupon Single User does, but without any custom programming; just begin the coupon code with the user's email address. So for the user email@example.com, the coupon code could be firstname.lastname@example.org or email@example.com or firstname.lastname@example.org_product23. It just has to begin with the customer's email address.
For more information, please visit this product's webpage.