How to write authorization through a VKontakte account?

Question

Python

There is a site on a python (on bottle).
You need to attach authorization through VK api.
On the Internet, instructions are everywhere on how to use authorization by obtaining a key.
But how to implement the scheme: the user enters the site, presses a button, a window appears asking for rights?
I have already registered the application in VK. What's next?

Answer 1

Obviously this is client side functionality, hence the JavaScript SDK.

Answer 2

Then we follow in accordance with the documentation Authorization based on OAuth 2.0 , in this case we have Authorization code flow (ACF) .
In fact, you need to implement the REDIRECT_URI logic (note: example.com/callback) , get the code parameter and send a get request to https://oauth.vk.com/access_token , example:
Result:
Having received such a result, we can already say that the user has authorized on your site, then using the access_token you access the rest of the VK API.