Singpass Face Verification checks whether an individual is who he claims to be, at a specific moment for a specific purpose, by verifying the captured facial images with the government's biometric database.
On the other hand, face surveillance is a broader term that refers to the technology that identifies individuals from a crowd using face recognition technology.
The key difference is that Singpass Face Verification always seeks the users consent before it is initiated for transactions.
Face Verification can be used as an alternative Two-Factor Authentication (2FA) method.