Batra Cart and Catalog Discounts for WooCommerce is a straightforward promotions screen: set the discount, choose who it applies to, and pick the dates.
Category and product discounts show the regular price crossed out next to the new price. Quantity discounts are applied in the cart and are not added on top of those prices. Products that already have a WooCommerce sale price are left unchanged.
This is a third-party extension by Batra (https://batra.by). It is not developed by, or affiliated with, WooCommerce or Automattic.
No external service is used. The plugin does not send store or customer data to third parties.