Discounts must be entered in settings such as services, where you can enter discounts for sales products and services, so that they are specifically based on one of the 2. In addition, you must be able to enter discounts not only by name, but also a fixed value, so that it is easy to pay for. You must be able to enter discounts by a certain validity date, so that discounts can no longer be clicked when the promotion is over. The system must also create barcodes directly for discounts or services that you create, so you can use them on your promotions, etc... and a hundred other things:)