You can't test list update items because there is no way to specify list id

https://developer.themoviedb.org/v4/reference/list-update-items

also I think adding comment doesn't work, at least not using the library that I use, that is why I wanted to test on website.

this is my response

 {"success":true,"status_code":1,"status_message":"Success.","results":[{"media_id":"945962","media_type":"movie","success":false}]}