I am using the Checkout module, together with Checkout by Email and Checkout by Paypal for my shopping cart system.
All this works well, but I would like to give my customers a Discount Coupon which can be used only once. So when they book an order, they enter the code, and when the discount is given and the order finished, this discount code can never be used again.
In the current setup, I can only set discount codes which keep on working, so if they place 5 orders, and hand out the code to their family and friends, they can also order with the same discount code.
Is there a workaround for this? Or did I set it up wrong somewhere?
Thanks in advance for the help!