POS: the details
Besides taking payment, today’s POS manages items and prices, deducts stock, issues receipts and invoices, closes out the register and keeps the sales history. In restaurants it adds tables, kitchen tickets and split checks. In practice it’s a store’s most reliable source of data: what was sold, when and at what price.
The problem appears when the POS is an island. If the online store, the warehouse and the register each keep their own stock, you sell what you don’t have. Integrating it means a sale at the register deducts from the same inventory as a sale on the website, prices and promotions are defined once and product information comes from a single place, usually a PIM. In Spain, invoicing software must also comply with the invoicing-systems regulation known as Verifactu.