¿Dónde debería poner las API keys de Discourse para poder obtener las publicaciones?

I’m not sure how you are making your api requests (which tool or programming language), but the api key and username go in the http header.

Here is a curl example from the Discourse API Documentation

curl -X POST "http://127.0.0.1:3000/categories" \
-H "Content-Type: multipart/form-data;" \
-H "Api-Key: 714552c6148e1617aeab526d0606184b94a80ec048fc09894ff1a72b740c5f19" \
-H "Api-Username: discourse1" \
-F "name=89853c20-4409-e91a-a8ea-f6cdff96aaaa" \
-F "color=49d9e9" \
-F "text_color=f0fcfd"
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