You're surely here because you want to find subtitle for specific shows.
The first step is to get the show unique id using either the TVDB or the name of the show.
Once you have the show it's easy to get subtitle for a specific episode of a season in the wanted language.
You can also get all subtitle for a season of a show if you prefer.
Once you have the unique id of the subtitle, you can use the download endpoint to download it.