Exclude categories and products for discount coupons

Matching the discount function "valid for category:" we have a function"invalid for category:"
and: matching "valid for product" we have developed the function"invalid for product".

So now if the coupon is valid for all categories except one, you only need to enter that one,
instead of a long list of category numbers.

Extremely helpful if you sell books!
You can put the books in category 10, for example, and ban them.
Even if you also link the books in other categories, quasi as cross-selling, they remain banned.

If someone puts a prohibited and a permitted product in the shopping cart and enters the discount code, then the permitted product is discounted,
the prohibited product remains outside.

You can also, for example, allow an entire category and only prohibit a specific product from the category.

Attention: This plugin does ** NOT ** work together with the plugin  “Show coupon discount directly on the article”