An update on Jan 31, 2019 gave channel moderators the ability to add comments to users within chat. There is currently no way to use the API to be able to set or retrieve comments for users in chat.

This should be available to the broadcaster and all moderators within a channel.

To add a mod comment to a user, the endpoint could take the following data as inputs:
- User: {user's name}
- Moderator: {mod's name}
- Broadcaster: {broadcaster's name}
- Comment: {comment to be applied}

On success, this would return the following:
- Success: {true}
- date: {date}
- User: {user's name}
- Moderator: {mod's name}
- Broadcaster: {broadcaster's name}
- Comment: {comment applied}

To retrieve mod comments of a user, the endpoint could take the following data as inputs:
- User: {user's name}
- Moderator: {mod's name (optional)}
- Broadcaster: {broadcaster's name}
- date: {date of comment (optional)}
- date range upper: {upper limit of date range (optional)}
- date range lower: {lower limit of date range (optional)}

On success, this would return the following for each comment:
- Success: {true}
- date: {date}
- User: {user's name}
- Moderator: {mod's name}
- Broadcaster: {broadcaster's name}
- Comment: {comment applied}