Hi I would like to buy this addons https://www.webdesigner-profi.de/joomla-webdesign/shop/addons/coupons-extrafields.html
but I didn't understand if it does these two things:
1) can I make the coupon nion work for products already discounted?
2) that the coupon is available only once for each customer (that if a customer uses it then he cannot reuse it other times, but if another customer uses it it works perfectly)
thanks a lot
stefano