Contactless Payments and QR Codes: How Digital Wallets Work

How QR Code Payments Work

A payment QR code contains the information a payment app needs to start a transaction: who is being paid, and sometimes the amount, currency and a reference number. The customer scans it with their banking or wallet app, checks the details, and approves the payment with a PIN, fingerprint or face scan.

Because the actual transfer happens inside the regulated banking or wallet app, the QR code itself does not hold any card numbers or passwords. It is simply a convenient way to fill in payment details without typing.

Static vs Dynamic Payment Codes

A static payment code identifies the merchant only. It is often printed on a sticker at the counter, and the customer types in the amount themselves. This is popular with small shops and market stalls because it requires no hardware.

A dynamic payment code is generated for each transaction by a till, terminal or website, and already contains the exact amount and order reference. It reduces mistakes and makes reconciliation easier for larger businesses.

• Merchant-presented: the shop shows a code and the customer scans it
• Customer-presented: the customer shows a code in their app and the shop scans it with a terminal
• Online checkout: a code on a computer screen lets the customer pay with their phone

Popular QR Payment Systems Around the World

QR payments became mainstream first in China through Alipay and WeChat Pay, then spread across Asia and beyond. India's UPI processes billions of QR-initiated payments every month, Brazil's Pix has become one of the country's most used payment methods, and Pakistan's Raast and many other national systems follow similar ideas.

Many of these systems are based on the EMVCo QR code specification, an international standard that defines how merchant and payment information is formatted so that different apps can read the same code.

Benefits for Businesses

QR payments remove the need for expensive card terminals, which makes them especially valuable for small and mobile businesses. Fees are often lower than card payments, and money usually arrives in the account quickly.

Combined with digital menus and ordering, QR codes let restaurants offer scan-to-order and scan-to-pay at the table, shortening waiting times and freeing staff for service.

• Low setup cost: a printed code may be enough to start
• Faster checkout and shorter queues
• Contactless and hygienic
• Digital records that simplify bookkeeping

Security Risks and Common Scams

The most common scam is the replaced QR code: criminals place their own sticker over a legitimate code at a parking meter, restaurant table or shop counter so payments go to them. Others send fake codes by email or text that lead to phishing pages asking for card details.

Merchants should check printed codes regularly, use tamper-evident stands or display codes on screens, and train staff to confirm the merchant name customers see in their app. Customers should always check the payee name and amount before approving, and never enter card numbers or banking passwords on a web page opened from an unknown code.

Best Practices for Accepting QR Payments

Display your payment code clearly at a comfortable height, with your business name and accepted apps printed next to it. Keep a printed backup of the official code in case a display is damaged.

Confirm every payment in your own merchant app or bank notification before handing over goods, rather than relying on a customer's screen, because fake confirmation screenshots are another common trick.

Designing a Smooth Customer Experience

A good QR payment experience starts before the customer reaches the till. Place the code where people can scan it comfortably without leaning over the counter, and make it large enough to read from arm's length. Show the logos of the apps you accept so customers know immediately whether they can pay.

For online stores, display the payment code clearly on desktop checkout pages and offer a direct button to open the payment app on mobile, because a customer cannot scan a code shown on the same phone.

After payment, send a digital receipt and make refunds simple. Clear communication builds trust, especially for customers trying QR payments for the first time.