Hey there @iamshimil
So there are actually a few ways to achieve user verification. Here they are:
1) You can either use one of our SDKs to make it happen (relatively the easier way):
2) Create the UI yourself and tie it with our Authentication API hitting the right endpoints:
https://auth0.com/docs/api/authentication
Depends on what are your development capabilities and time resources. Here you can read more about Lock vs custom UI:
Hope it helps!