Cashback for WooCommerce

Hi! We’re having an issue, as my client have 23% vat on each product, and customers are using cashback on NET PRICE. That gives them additional value, which we’re not OK with 🙂

Please work it out in a way, that the cashback will lower the GROSS Price (insluding VAT), not the NETTO price (without VAT). It’s really important for each customer in EU.