Years ago, the only way to shop was by paying cash. When the buyer has a previous relationship with a retail store, they pay by check, even though that type of transaction is getting more distant.
The reason for using checks is that they are more convenient to carry and much safer. However, over the last 15 years, debit and credit cards have become more and more used for payments. The usual procedure is to slide the card into a machine called a point of sale. You can now look for the best inventory control system via https://www.orderhive.com/inventory-control.html.
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POS is a common sight in most of today's retail stores. The POS system used to pay money is a link (via the Internet) between the retailer's machines and their bank. The working system is more or less like an ATM that we use to withdraw cash.
When a buyer uses their debit or credit card to make a payment, the digital information on the card is transferred to the merchant's bank, which in turn charges a fee for the deal through an intermediary such as Visa, MasterCard, or another agent.
The debit card holder's account will be charged accordingly, while the merchant account will be credited. The manner in which invoices are issued in major stores is also changing rapidly. Most distribution chains have abandoned the usual way of displaying prices by writing them on labels and then pasting them on displays.