Is code vk api unique?

Question

API

Hello, I have not worked with vk api before. Now I had to work,
I watched several videos about api and I had this question:
Can I work in my database with a user and get only the first name, last name and main picture through code?
and even during authorization, how is the user recognized, through code? or token?
For example, someone logged in via VK on my site, after that how can I recognize that this or that person is through code? or token?

Answer 1

Using code, you need to get an access_token: documentation .