If you don't pass the parentId parameter, then an array of the all categories is returned. If you specify 0 for the parentId, then an array of the top categories is returned. If you specify other number for the parentId, then an array of the direct child categories is returned. If you specify a date for the gmtModifiedStart, then an array of the categories ever changed since 'gmtModifiedStart' is returned.
Request
Body Params application/x-www-form-urlencodedRequired