Is there anything in the Discourse API that can help you like a post?

Yes, see How to reverse engineer the Discourse API and Discourse API Docs

what is the “post_action_type_id”?

For like it is 2 as you can check via How to reverse engineer the Discourse API

Как лайкнуть конкретный пост через API?

Falco (Falco) 20.Апрель.2022 16:04:15 5

Это как 2, что можно проверить на Reverse engineer the Discourse API

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