Hi @maicol07
I was doing some testing in my local environment and I think I found a bug in your PHP plugin. If you change the slug driver of Users to 'id' instead of 'default' the code will make an incorrect request to the forum API.
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However, if you restore the 'default' value to the database again, it works without problems.
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The error is 404 Not Found
with a URL like: <domain>/api/users/<username/?bySlug=1
Let me know if you need more details to reproduce it.