How Modern POS Cash Registers Transform Retail Payments

1. What is a cash register?

Cash registers consist of hardware and software systems used to record transaction data, manage inventory, handle membership, and complete payments.

In the new retail industry, the most common form is the POS all‑in‑one machine.

2. All‑in‑one machine peripherals

To achieve cash register functionality, additional devices such as barcode scanners, scanner boxes, cash drawers, card readers, keyboards, label printers, receipt printers, kitchen printers, announcement speakers, facial‑recognition devices, and palm‑print devices are required.

Merchants can customize peripheral combinations based on industry scenarios and checkout habits; manufacturers may integrate some devices internally while providing ports for external accessories.

3. Classification of all‑in‑one machines

3.1 By operating system

Cash registers are divided into WPOS (Windows POS) and MPOS (Mobile POS). MPOS devices on the market are mainly Android‑based POS machines, referred to as APOS.

WPOS offers higher price and configuration but easier software switching. MPOS/APOS is lower‑cost with limited configurability and typically pre‑installed software that cannot be changed later.

3.2 By usage scenario

1) Desktop cash register – placed on a desk, available in single‑screen or dual‑screen touch versions, can connect facial‑recognition, palm‑print, barcode scanners, etc.

2) Self‑service cash register – large‑screen devices deployed in supermarkets to allow customers to check out without queuing.

3) Unmanned cash register – used in unattended retail locations such as subway stations, hospitals, and offices, enabling automatic product sales without staff.

3.3 By business type

1) Retail cash register – used in supermarkets, convenience stores, and fresh‑food shops; supports scanning, weighing, change‑making, receipt printing, and shift handover. Supermarkets often include cash drawers; fresh‑food stores may use integrated weighing scales.

2) Food‑service cash register – used in small restaurants and canteens; features kitchen ticket printing, order taking, and membership management. Single‑ or dual‑screen touch models are common; for dishes requiring weighing, integrated scales are chosen.

4. Problems solved by cash registers

The ultimate goal is to improve checkout efficiency and enable digital store management, benefiting both merchants and customers.

4.1 From the merchant's perspective

Cash registers act as data collectors for daily operations, automatically updating order status, generating transaction logs, and adjusting inventory after payment.

Back‑office systems receive raw data, generate reports, and allow real‑time monitoring of sales and stock levels via mobile apps or dashboards.

Financial data supports decision‑making, while inventory data helps maintain optimal stock, preventing overstock or stock‑outs and increasing profit margins.

4.2 From the customer's perspective

Issues such as limited payment methods, long queues, and lack of price information can deter purchases. POS cash registers address these by supporting multiple payment options, automatically retrieving promotions, and speeding up checkout.

AI‑enabled dual‑screen devices can recognize items placed on the scale via built‑in cameras, eliminating manual scanning and displaying order details on a secondary screen.

5. How cash registers work

5.1 Product entry

Standard items are entered via barcode scanners or scanner boxes. AI‑enabled devices use cameras to identify products automatically. Weighted items are processed by integrated scales that calculate price based on weight.

If scanning fails, manual entry via keyboard is possible.

5.2 Order placement and payment selection

Cash payment triggers the cash drawer to open. Membership cards or phone numbers are used for stored‑value deductions. Coupons are applied internally. Card payments use the POS reader. QR code payments (B‑scan‑C) read the customer's mobile payment code via scanner.

Biometric payments (face or palm) invoke third‑party platforms to obtain a barcode representing the biometric data, then complete the transaction.

5.3 Payment success

After successful payment, the POS receives the result, announces it via speaker, and prints receipts. In restaurants, both front‑of‑house receipts and kitchen tickets are printed; for delivery orders, an additional delivery slip is generated.

6. Supporting services

All steps—product entry, order creation, payment selection, payment processing, and printing—require backend services to provide data, routing, and templates.

When a payment is initiated, the backend generates a bill, calls the payment core, and the POS polls for the result. Upon success, the system records the transaction, updates inventory, and prints the appropriate receipt.