Adding a discount on a product added to the cart on the fly

[MarcinSta]

It is possible to add a discount on a product added to the cart on the fly - without a discount code (discount for a specific product and a specific customer).
Scenariu:
1. The customer adds the product to the cart
2. the application receives information about adding the product to the cart by the customer - calculates a discount
3. the app sends the product discount to the store - the customer sees the updated price in the cart