@raf555 That will probably take them a year or two. Meanwhile, non-api way:
(using the same User-Agent + mangadex_session cookie authentication)
Additional header:
	
	
	
		
Type: GET
unfollow: mangadex.org/ajax/actions.ajax.php?function=manga_unfollow&id=123&type=123
type: same as id
follow: mangadex.org/ajax/actions.ajax.php?function=manga_follow&id=123&type=1
types: (correspond to MD list id's)
	
	
	
		
			
			(using the same User-Agent + mangadex_session cookie authentication)
Additional header:
		Code:
	
	{  'X-Requested-With': 'XMLHttpRequest'}
	Type: GET
unfollow: mangadex.org/ajax/actions.ajax.php?function=manga_unfollow&id=123&type=123
type: same as id
follow: mangadex.org/ajax/actions.ajax.php?function=manga_follow&id=123&type=1
types: (correspond to MD list id's)
		Code:
	
	 {
    Reading: 1,
    Completed: 2,
    'On hold': 3,
    'Plan to read': 4,
    Dropped: 5,
    'Re-reading': 6,
  };