Biometric Payments Boom: Face, Fingerprint & Palm Authentication Replacing PINs

Key Takeaways

• Biometric credit cards carry a fingerprint sensor on the card's body; your fingerprint template is stored on the card chip.
• Biometric authentication cannot be guessed, skimmed, or shared, making it considerably harder to compromise than a 4-digit PIN.
• PIN is retained as a fallback — biometrics reduce day-to-day dependence on it, not eliminate it entirely.

Every time you wait for an OTP that arrives late or shield your PIN at a crowded checkout counter, the risk of failed payment is obvious.

A stolen card and a guessed Personal Identification Number (PIN) are all it takes for a fraudulent transaction to go through.

Biometric payment technology fingerprint sensors on card bodies, facial recognition for Unified Payments Interface (UPI) transactions, and palm-based verification is moving from pilots to real deployments.

Table of Contents

1. How Do Biometric Cards Work
2. Why Are Biometrics Safer Than a 4-Digit PIN
3. What Is Happening with Biometric Payments in India
4. How to Keep Your Card Secure
5. Conclusion
6. Frequently Asked Questions
7. References

How Do Biometric Cards Work

A biometric payment card looks like a standard credit card or debit card with one addition: a small fingerprint sensor on the card body.

When you tap or insert the card at a point-of-sale (POS) terminal, you place your registered finger on the sensor simultaneously.

The card matches the scan against the encrypted template on its chip if there is a match; the transaction is authorised.

The entire process occurs on the card; no biometric data is transmitted to the terminal, the bank, or the merchant.

Enrolment: Before using a biometric card, you register your fingerprint either at a bank branch or at home using a near-field communication (NFC)-enabled smartphone and the bank's app.

In both cases, the fingerprint template is written directly to the card's secure chip.

What is stored: No fingerprint image is held on the card. A numerical representation of your fingerprint unique characteristics, the fingerprint template is encrypted on the chip. It cannot be reverse engineered into an image or read by any external device.

The card works with existing contactless infrastructure; no terminal upgrades are required for merchants.

Why Are Biometrics Safer Than a 4-Digit PIN

A 4-digit PIN has 10,000 possible combinations. In practice, people might use predictable numbers- birth years, repeating digits, or sequential patterns. This creates several vulnerabilities:

• Shoulder surfing: An observer at a terminal or ATM can capture your PIN entry.
• Card skimming: Fraudulent devices on ATMs capture card data and PIN simultaneously.
• Social engineering: Fraudsters impersonating bank staff extract PINs over calls.
• OTP interception: Phishing and SIM-swap fraud allow fraudsters to intercept one-time passwords (OTPs).

Biometrics remove all these risks at once. Your fingerprint cannot be guessed, captured by a skimmer, or handed over in a call.

The encrypted template on the chip cannot be extracted or replicated.

What Is Happening with Biometric Payments in India

UPI Biometric Authentication

Since October 2025, UPI users can authenticate transactions using their smartphone's fingerprint or face recognition instead of a UPI PIN. This is opt-in and uses Aadhaar-registered biometrics. The PIN remains as a fallback. India's Aadhaar infrastructure recorded over 2.2 billion authentications in August 2025 alone underlining the scale of the system already in place.

Payment Passkeys

For online transactions, payment networks are rolling out passkey-based authentication. A payment passkey is a cryptographic key stored on your device, protected by your device biometric. Instead of entering card details and waiting for an OTP, you authenticate via fingerprint or face. Biometric data stays on the device; card details are replaced by encrypted tokens that cannot be reverse engineered, even if intercepted.

Face Pay and Palm Scanning

Face-based authentication is now available for UPI. Palm vein scanning; which reads unique vein patterns beneath the skin using near-infrared light is being piloted in retail environments globally. Widespread deployment at Indian POS terminals is a longer-term prospect, given the hardware requirements involved.

How to Keep Your Card Secure

Kotak Mahindra Bank applies multiple security layers across physical and digital card transactions.

• Cards should always be swiped or tapped in the cardholder's presence.
• Instant transaction alerts are available when your mobile number is registered, allowing unrecognised transactions to be flagged without delay.
• Online transactions are secured through Verified by Visa (VbV) and MasterCard SecureCode (MCSC), adding an additional authentication step for every online purchase.

Conclusion

Biometric payment technology addresses the core weaknesses of PIN and OTP-based authentication.

Fingerprint sensors on card bodies, face authentication for UPI, and device-bound payment passkeys all work on the same principle; your identity is the credential, and it stays with you.

India's regulatory framework has formalised this shift, and deployment is already under way at scale.

Understanding how the technology works and what protections are already in place is practical knowledge every cardholder needs.

Kotak Mahindra Bank continues to build multiple authentication layers, keeping your transactions secure as biometric adoption grows.