The process at the entry gate is as follows: first scan the boarding pass and then face biometric is captured and matched with the credentials submitted in advance by the passenger. This ensures a 1:1 match i.e. your live face is matched with the face that you had shared in advance. This is from a security perspective. But later on as the Digi Yatra process evolves, the vision is to have a barrier-less process at all check points from airport entry gates to the boarding gates.