Commenting system using VK API?

Question

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It is necessary to make a web service that should analyze a post on a wall in a group (vk.com) and leave a comment. There were no problems with the analysis, but to leave a comment you need to get confused.
There is an API method , I can't figure out the authorization. It says there:

This method is available only to Standalone applications

Can a web service be a standalone application?
Who faced this please tell me?

Answer 1

Found a solution here

Answer 2