Biometric Payments
What Are Biometric Payments? Definition and How They Work
Definition
Biometric payments are payment transactions authenticated using a physical or behavioural characteristic of the payer as the verification factor, rather than a PIN, password, or card tap. The authentication modality may be fingerprint, facial recognition, iris scan, voice recognition, or palm vein pattern, either as a standalone authentication mechanism or as the biometric factor within a multi-factor Strong Customer Authentication flow.
How it works
Biometric payments combine two components: biometric capture and identity binding. Biometric capture reads a biometric characteristic using a sensor: a fingerprint sensor on a smartphone or payment terminal, a camera-based facial recognition system, or a contactless palm scanner. Identity binding links the captured biometric to a payment credential (a card token, a bank account, or a digital wallet) held by the biometric authentication system.
In smartphone-based biometric payments (Apple Pay, Google Pay), the biometric authenticates the device rather than communicating biometric data to the card network or merchant. The user's fingerprint or face unlock the device's Secure Enclave, which then signs the payment request with the stored private key. No biometric data leaves the device; the payment network receives only the cryptographic payment credential.
In-store biometric payments use dedicated hardware to capture the biometric at the point of sale. Amazon's Palm Recognition (One) uses contactless palm scanning linked to the customer's Amazon account and payment method. JCB has piloted biometric payment cards in Japan, where a fingerprint sensor embedded in the card authenticates the cardholder at the point of sale. Some Asian markets (China's Alipay, WeChat Pay) use facial recognition terminals at POS.
Under PSD2 and SCA requirements, a biometric can serve as the inherence factor (something you are) in a multi-factor authentication combination alongside a possession factor (the device) or a knowledge factor. Device biometrics on FIDO2-capable devices can simultaneously satisfy both inherence and possession factors, enabling single-gesture SCA compliance.
Why it matters
Biometric authentication eliminates the friction of PIN and password entry while providing equal or stronger identity assurance. At the payment terminal, a palm scan or facial recognition reduces checkout time to under a second, improves accessibility for customers with dexterity limitations, and eliminates PIN shoulder-surfing risk.
For card-not-present payments, device biometrics (fingerprint, Face ID) have become the dominant SCA mechanism for mobile payments, replacing SMS OTPs in the cardholder authentication step of 3DS2 flows. Biometric-authenticated transactions have lower false decline rates than OTP-authenticated transactions because issuers assign higher trust to a FIDO2 biometric credential than to a knowledge-based authentication.
Privacy regulation is the primary constraint on biometric payment expansion. Biometric data is classified as special category data under GDPR and similar frameworks, requiring explicit consent for collection and strict data minimisation requirements. On-device biometric storage (where the biometric template never leaves the device) is the privacy-compliant architecture; centralised biometric databases create significant regulatory and security risk.
With PXP
PXP supports merchants and partners across the payments value chain. To talk through biometric authentication as part of your payment strategy, get in touch with our team.
Frequently asked questions
Is biometric payment data stored by the merchant?
In device-based biometric payment systems (Apple Pay, Google Pay, FIDO2 passkeys), biometric data is stored locally on the device and never transmitted to the merchant, card network, or payment provider. The merchant receives only a cryptographic payment token. In retail biometric systems (Amazon One, facial recognition POS terminals), biometric templates are stored in the operator's secure database, subject to applicable data protection requirements including explicit consent under GDPR and equivalent frameworks.
Are biometric payments more secure than PIN?
Biometric authentication on modern devices is generally more secure than PIN for most threat models: biometrics cannot be guessed, are difficult to replicate without specialised equipment, and cannot be shoulder-surfed. However, biometrics are irrevocable: if a fingerprint database is compromised, the victim cannot change their fingerprint. PIN can be changed after compromise. On-device biometric storage mitigates the database compromise risk by ensuring biometric templates never exist in centralised, hackable form.
What regulations apply to biometric payment data?
Biometric data is classified as sensitive personal data under GDPR in the EU and the UK, requiring explicit consent for processing, a lawful basis specific to biometric data, and data minimisation. In the US, Illinois BIPA (Biometric Information Privacy Act) and similar state laws impose consent, retention, and destruction requirements for biometric data collection. Organisations collecting biometric payment data must comply with applicable regulations in each jurisdiction where they operate.
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