New biometric payment system introduced by Amazon, another big step into making payments more contactless.

Amazon on Tuesday unveiled a new biometric payment system using palm recognition, to be made accessible to match retailers and also advanced as a substitution for identification section at stadiums or workplaces.

The system  Amazon One is said to be “a fast, convenient, contactless way for people to use their palm to make everyday activities like paying at a store, presenting a loyalty card, entering a location like a stadium, or badging into work more effortless.”

The system is developed as “a quick, reliable, and secure way for people to identify themselves or authorize a transaction while moving seamlessly through their day.” said Amazon vice president Dilip Kumar.

The system will be installed at  Amazon Go retail locations, starting with two stores in Seattle, Washington.

The shift has also raised privacy concerns about how biometric data will be safeguarded and protected from hackers.

According to Amazon, the data would be”protected by multiple security controls and palm images are never stored on the Amazon One device” but send to a “highly secure area we custom-built in the cloud.”

Doug Stephens of the consulting firm Retail Prophet, said Amazon would need to protect the data to gain user trust in the system to make it mainstream.

“Biometrics as a form of ID/payment etc. has always made ultimate sense,” Stephens said on Twitter. “The question is, will Amazon mainstream our comfort with them or violate our trust?”