Pedro Azevedo, it looks like the slash was causing issues with the parsing. I changed the one you have mapped in your HTTP with a dash - and it worked.
This version of HTTP API is an older version now that could run into these issues. To address this, the team pushed out a new version that is easier to map and you don't even need to add quotes around the column tokens.However, old columns don't update so you'll need to add a new HTTP API column to get that new version working.