Seems like the content of documentation seeped into the title? The title is comically long and I doubt it was intentional because ... messages as read, unread, unseen, seen or unseen part is also present in the body's markAs prop.
optionally you can pass feed id or array to mark messages of a particular feed is definitely not the part that should be in the title, so I am assuming this is the case.
Path: /api-reference/subscribers/marks-all-the-subscriber-messages-as-read-unread-seen-or-unseen-optionally-you-can-pass-feed-id-or-array-to-mark-messages-of-a-particular-feed
Seems like the content of documentation seeped into the title? The title is comically long and I doubt it was intentional because
... messages as read, unread, unseen, seen or unseenpart is also present in the body'smarkAsprop.optionally you can pass feed id or array to mark messages of a particular feedis definitely not the part that should be in the title, so I am assuming this is the case.