How to make automatic posting from the site to the wall of the VK community?

Question

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There is a site where, after certain user actions (adding a post), this post should automatically post on the wall in VK in the group.
As I understand it, the wall.post method is used for this , but the bottom line is that in order to use this method, you need to authorize the user, and I do not want to do this. I need automatic posting through the site.
How to post on VK without authorizing the user on the site?
Through the group, you can get a token to work with the API, but it does not provide for posting to the wall.

Answer 1

display news in RSS
and there is a guide on how to publish posts from RSS to a group https://vk.com/page-59800369_46114205