How to add additional costs to a product and add it as a sum charge in the cart
I've got shop that sells different kinds of bottles (wine, whisky, vodka,etc). Some of the bottle have a recycling fee. The amount of the fee differs from product to product.
What I need to achive is adding the recyling fee multiplied with the amount of each of the products added to the cart. All the recycling fees of all products should be shown as a sum in a charge row in the cart (just like a shipping tax):
product1 5x 5 cents
product2 3x 10 cents
product1 8x 0 cents
recyling tax: 55 cents
I can't find a way to achieve this. Can anyone please give me a hint how to solve this problem?