Contactless Payments: How to Tap and Pay More Safely

Contactless payments let you pay by tapping your card or phone on a reader, and you can make them safer by using a few simple habits: keep your card in a shielded sleeve, enable all available security features on your phone, and set transaction limits. This article explains how the technology works, what the real risks are, and the practical steps you can take to protect your money and data.

How Contactless Payments Work

Contactless payments use near-field communication (NFC), a short-range wireless technology that works within about 4 centimeters (1.5 inches). When you tap your card or phone near a payment terminal, the terminal powers the chip in your card or phone, which then sends encrypted payment data. This data is a one-time code called a token, not your actual card number. The token is useless if intercepted because it can only be used for that single transaction.

For cards, the chip generates a unique cryptogram for each transaction. For phones and smartwatches, the device uses a virtual card number (device account number) that is stored securely in a dedicated chip called the Secure Element or in the device’s secure enclave. Even if a thief copies the data from your phone, they cannot use it to make a new payment because the token is tied to that specific device and transaction.

Why Contactless Is Generally Safe

Contactless payments are often safer than swiping or inserting a card because the card never leaves your hand, and the merchant never sees your card number. The tokenization process means your real account number is not transmitted or stored by the merchant, reducing the risk of data breaches at the point of sale.

Additionally, most contactless transactions have a low-value limit (e.g., $100 or its equivalent in local currency) that requires no PIN or signature. For larger amounts, you must enter a PIN or use biometric authentication on your phone. This two-factor approach adds a layer of security: even if someone steals your card, they cannot use it for high-value purchases without your PIN.

How to Tap and Pay More Safely: Step-by-Step

To maximize safety when using contactless payments, follow these steps:

• Use your phone or watch instead of your physical card when possible. Mobile wallets require biometric authentication (fingerprint, face ID) or a PIN for every transaction, adding an extra layer of protection.
• Keep your card in a shielded sleeve or RFID-blocking wallet. This prevents skimming attacks where a thief with a portable reader can read your card’s data from a distance.
• Set a low contactless limit on your card. Some banks allow you to adjust the limit via their app. A lower limit means less risk if your card is stolen.
• Enable transaction alerts on your bank app. You’ll get notified instantly of any contactless payment, so you can spot unauthorized activity quickly.
• Turn off NFC when not in use. On most phones, you can disable NFC in settings, which prevents any accidental or malicious reads.
• Check the terminal before tapping. Look for the contactless symbol (four curved lines) and ensure the terminal looks legitimate. Avoid tapping on suspicious or damaged readers.
• Use a strong lock screen on your phone. If your phone is stolen, the thief cannot access your mobile wallet without your PIN or biometrics.

Common Misconceptions and Real Risks

Many people worry about “digital pickpocketing” where a thief stands close and scans your card through your pocket. While this is technically possible, it requires the thief to be within 4 cm of your card, and the stolen data is a token, not your card number. The token cannot be used to make a payment because it is tied to a single transaction and a specific terminal. Therefore, the risk of financial loss from this type of attack is very low.

A more realistic risk is losing your card or phone. If you lose your card, a thief could make small contactless purchases until you report it. Most banks offer zero-liability protection, meaning you won’t be held responsible for unauthorized transactions if you report them promptly. For phones, the risk is even lower because the thief would need to bypass your lock screen and biometric authentication.

Another misconception is that contactless payments are less secure than chip-and-PIN because they don’t require a signature. In reality, the cryptogram generated for each transaction is far more secure than a signature, which can be forged. The lack of signature is a convenience, not a security weakness.

How to Choose Between Card and Mobile Wallet

When deciding whether to tap with a card or a phone, consider the following:

• Security: Mobile wallets are generally more secure because they require biometric authentication for every transaction. Cards can be used without any authentication for small amounts.
• Convenience: Phones are more convenient if you carry multiple cards, as you can store them all in one wallet app.
• Battery life: If your phone dies, you can’t pay with it. Carrying a physical card as a backup is wise.
• Compatibility: Some older terminals may not support mobile wallets, but most modern ones do. Cards work everywhere contactless is accepted.

Costs and Limits

Contactless payments are generally free for consumers. Banks and card networks do not charge a fee for using contactless technology. However, merchants pay a small transaction fee to the card network, which is typically the same as for chip or swipe transactions.

Contactless limits vary by country and bank. In many places, the limit is around $100 or €50, but some banks allow higher limits for phones because they have additional authentication. You can usually check your limit in your bank’s app or on their website. If you want to change the limit, you may need to contact your bank.

Alternatives to Contactless Payments

If you prefer not to use contactless, you have alternatives:

• Chip-and-PIN: Insert your card and enter a PIN. This is still widely accepted and offers similar security.
• Magnetic stripe: Swipe your card and sign. This is less secure because the stripe data is static and can be skimmed.
• Cash: No digital footprint, but you risk losing it or being robbed.
• Online payments: Use your card or a digital wallet for online purchases. These often require additional verification like OTP or 3-D Secure.

Frequently Asked Questions

Is it safe to tap my card without a PIN?

Yes, for small transactions. The contactless limit is designed to keep the risk low. If your card is stolen, the thief can only make a few small purchases before hitting the limit. Once you report the loss, you are typically not liable for unauthorized transactions.

Can someone steal my card details by standing close to me?

Technically, they could read your card’s data with a portable NFC reader, but the data is a token that cannot be used for payment. The token is transaction-specific and expires quickly. The risk of financial loss from this type of attack is extremely low.

Should I use a contactless card or a mobile wallet?

Mobile wallets are generally safer because they require biometric authentication for every transaction. Cards are convenient but can be used without authentication for small amounts. If you want maximum security, use a mobile wallet.

What should I do if my card or phone is lost or stolen?

Immediately contact your bank or card issuer to freeze your account and report the loss. For phones, use the “Find My” feature to remotely lock or wipe the device. Most banks offer zero-liability protection if you report promptly.

Do contactless payments work when my phone battery is dead?

No, you need power to use NFC. Some phones have a power reserve that allows a few taps even when the phone is off, but this is not universal. Carrying a physical card as a backup is a good idea.

Are there any fees for using contactless payments?

No, consumers are not charged extra for contactless payments. The merchant pays a transaction fee to the card network, which is the same as for any card payment. You won’t see any additional charges on your statement.

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