How to transfer VK user id to the site?

Question

In contact with

Hello
Vkontakte.
A user who is a member of a group presses a button or link in the group and an http request is generated that contains the id of this user.
Is it possible to implement this provided that each user does not have a page with questions to grant rights to the application?
Or otherwise - is there a way to redirect the user from a contact to another site to fill out a form so as not to force him to enter his VKontakte data in this form?