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 Reverse engineer the Discourse API

¿Cómo puedes dar 'me gusta' a una publicación específica a través de la API?

Falco (Falco) 20 Abril, 2022 16:04 5

Para como es 2 como puedes comprobar en Reverse engineer the Discourse API

Tema		Respuestas	Vistas
Getting who liked a post from the API Development	7	2901	18 Mayo 2022
Get number of likes for a single post? Development rest-api	6	2098	20 Marzo 2023
How to unlike a topic or post Development rest-api	6	475	24 Junio 2024
Discourse Likes API Development rest-api	6	1277	16 Diciembre 2022
How to get the likers of the topic with api Support	5	1572	26 Noviembre 2015