How to call groups.getById vk api in 2019?

Question

API

Due to recent changes in the security policy, VK could not find a simple answer to my question ...
How to get a link to a group avatar via api?
I don’t want to use different libraries, it would be enough just to call getById with a getom
Created a VK Standalone application to get the Service Access Key
But I didn’t understand what exactly the access_token or oauth parameter is ... A bunch of
conflicting answers with examples that no longer work.
Because client application - I don’t want to burn the community key, but I don’t feel sorry for the application, all the more you need to get public data

Answer 1

Hmm, somehow dug up the answer...
Firstly: https://vk.com/dev/implicit_flow_user
Secondly, the version must be indicated: "&v=5.92"