Add the param type_=All
Not sure why that's needed since it's listed as an optional parameter, but it is. You'll also need to use max_depth
or use limit
and page
to get them all.
I usually use max_depth
and load all of the top-level comments and 2 levels of replies to those (max_depth = 3) and if any of those have replies, I have a "Load more" button below the comment which will fetch again with that comment as the parent id.