Notifies discount that it was applied on given amount of items.

Returns true if this discount can be used repeatedly.

Returns IDs of SKUs which could be discounted if present in cart. Most important products go first.

Sets discount to its initial state.

Indicates if this discount is affecting the price of given cart item, i.e. this method returns true for items discounted by this discount.

Indicates if this discount is based on given cart item, i.e. this method returns true for items needed to be in the cart to be eligible to get this discount.

Sorts cart items according to priority. Places items preferred to be discounted on the beginning of list.