I need to set up the promotion with promotion codes, which customers can use only one time.
When some code is used, then any one can't use a same code again.
I wuld like to set up a promotion and also import teh codes.
Can somebody help me?
May be the following feature can help you:
http://docs.cs-cart.com/4.5.x/user_guide/manage_products/promotions/auto_coupons.html