Retrieve the subscribers id who watched video - youtube-api

Question

Overall Goal: To report possible subscribers who are not active on my YouTube channel.
I'm reading through the YouTube Data API (v3) trying to understand how to retrieve the actual ids who watched a specific video. I know you can get the number of views, but I don't see any call/response that shows you the subscriber ids. Has anyone done this?
So far what I gathered from the docs and Google searching is that this was possible using the Watch History of a subscriber, but that's been deprecated.
Thanks in advance!

Answer 1

So I do not believe it's possible to get IDs of users who have watched certain videos but I have a workaround for my use case; reporting inactive subscribers. This is not the best but it'll get me somewhere.
YouTube's API is very limiting now, but by calling the Subscriptions API
https://www.googleapis.com/youtube/v3/subscriptions?part=snippet%2CcontentDetails&mySubscribers=true&key=[YOUR_API_KEY]
I am able to get all subscribers with their channel IDs. Then after saving their IDs, I can check each one's statistics by making this call:
https://www.googleapis.com/youtube/v3/channels?part=statistics&id=[SUB_ID]&key=[YOUR_API_KEY]
which I receive a response like this:
{
"kind": "youtube#channelListResponse",
"etag": "\"j6xRRd8dTPVVptg711_CSPADRfg/AZpZT_vQrY3UTi57ia_QqrKdc8c\"",
"pageInfo": {
"totalResults": 1,
"resultsPerPage": 1
},
"items": [
{
"kind": "youtube#channel",
"etag": "\"something\"",
"id": "[SUB_ID]",
"statistics": {
"viewCount": "0",
"commentCount": "0",
"subscriberCount": "1",
"hiddenSubscriberCount": false,
"videoCount": "0"
}
}
]
}
Using this response (see "statistics"), I am making a generalization that if the subscriber has no comments AND no videos, then it's a safe bet that they are not active.