A POS (Point of Sale) terminal or card reader is the physical device, application, or virtual payment gateway that allows companies and businesses to receive card payments, with or without the presence of the buyer, using most cards on the market (Visa, MasterCard, Diners, Discover, American Express, UPI, JCB) and also Bizum or other payment methods (such as, for example, Alipay or WeChat). There are several types of POS machines (Android, Fixed, etc.) and POS with software (e.g. Virtual) to choose from, adapted to the needs of each business and/or professional sector (hotel and catering, tourism and hotels, retail, etc.).