Thanks to money transfer apps like Apple Pay and Android Pay, paying for things with a fingerprint has become commonplace - but what about paying for things with your actual finger itself?
Payment technologies company Sthaler has been looking at alternative payment methods, and thinks it's cracked a more secure method than the traditional fingerprint.
Rather than analysing the print, the Fingopay system uses a reader which shines Near-Infra-Red light through the finger, illuminating the miniscule veins before capturing the resulting image.
Users register this unique pattern against their chosen payment method, at which point it is converted to a cryptokey and tokenised.
When they pay for something at a point-of-sale terminal, the reader compares their vein pattern with the one on file, and authenticates the sale.
Sthaler is currently trialling the system for three weeks with WorldPay and Visa Europe Collab, the European innovation and investment arm of Visa, and the system is currently running in a restaurant at WorldPay's London headquarters in Bank.
Sthaler CEO Nicholas Dryden said: "Our ultimate goal is to make payments even safer, even simpler and more reliable.
"The benefit of working with Visa Europe Collab and Worldpay is that we have access to some of the best commercial minds in payments. This will help us to better understand how we can make finger vein technology even more convenient and secure for both merchants and consumers."
Nick Telford-Reed, director of technology innovation at Worldpay, added: "Our aim is to continually develop and enhance payments security, in order to provide increased reassurance for consumers and retailers, whilst creating the most frictionless experience possible."
It has already garnered hundreds of signups and positive reactions, according to the biometrics firm, after first being manufactured by Hitachi as a medical device to detect early signs of heart disease.
After seeing Sthaler's uses for the device, however, Hitachi entered into an exclusive partnership with the company, granting it sole rights to the technology for payment and authentication purposes.
Sthaler claimed that as it doesn't leave external traces in the same way a fingerprint does, its technology is more secure than other methods.
It also envisions more uses for the technology than simply payments, planning to integrate loyalty schemes and customer identification methods with the device to let customers pay for transactions, collect loyalty points and activate deals with just one action.
Eventually Fingopay could even replace passwords, and be integrated into users' homes in the future, said CEO Dryden.
