Fans chose to opt in to the first-of-its-kind service by registering on the MLB Ballpark app using a selfie, that selfie is then turned into a numerical code - or token - tied to the ticketholder's account.
"When the fan walks through the clearly-marked "Go-Ahead Entry Lane," a facial authentication camera scans the fan's face to match with the enrolled tokens in the system to see if there's a match."
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