Customers at Roundy’s Pick ‘n Save Metro Market grocery stores can now leave their wallets at home following the introduction of a Pay By Touch system.

Shoppers first have to complete a short Pay By Touch enrolment, where their finger is scanned and details of reward cards and payment cards added onto the system.

San Francisco-based Pay By Touch, which developed the system, said the finger scanning technology does not store actual fingerprints; instead, it creates a set of 40 data points that cannot be reverse engineered back to a fingerprint. Once enrolled customers can simply scan their finger and select a preferred payment method every time they pay, no matter what store or state they are in.

Pay By Touch has also recently been implemented into Piggly Wiggly Carolina stores throughout South Carolina, and has been operational in Seattle for over two years.