If you want to sell your products with a discount, for a product getting close to its expiration date for example, you can use discount tags. They allow you to scan discount barcodes.
To use discount tags you will need to use a barcode scanner, you can see the documentation about it here :doc:`barcode`.
To use discounts tags, we need to learn about barcode nomenclature.
Let's say you want to have a discount for the product with the following barcode:
You can find the Default Nomenclature under the settings of your PoS interface.
Let's say you want 50% discount on a product you have to start your barcode with 22 (for the discount barcode nomenclature) and then 50 (for the %) before adding the product barcode. In our example, the barcode would be: