In order to get all categories for provided sport, use URL:
Base url /getCategoriesForSport
To manage with categories search, i.e:
getting categories with only filled tournaments(tournaments which have at least one match)
getting categories with only current matches(matches which have odds) or finished matches (matches with results)
Base url /getCategoriesForSportFilter
With known sport id and category id in order to get list of tournaments use URL:
Base url /getTournamentsForCategory