SYRACUSE, N.Y. — Why did biometric payment flop in the supermarket industry? That was the question on the mind of many retailers after Pay By Touch, San Francisco, “regretfully” pulled the plug on its finger-scan payment technology at about 400 supermarkets one minute before midnight on the evening of March 19, according to a statement. Pay By Touch, owned by Solidus Networks, launched its service in 2002, allowing shoppers to pay for purchases merely by placing their index finger on a ...

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