You need the owner of the channel you want to get events for to go through the authentication flow for your app and that will provide you with a User Token that you can use to get subscriber events for their channel. For bits any scope will work, you don’t need a specific one, but it does have to be from the channel owner of the channel you want events for.
Alternatively you can use an IRC or Websocket connection to Twitch Chat and listen to events through that https://dev.twitch.tv/docs/irc/ but again you will need permission from the channel owner to do so or you could be breaking the Developer Agreement.
Will individual chat messages have any information that tells me that they are cheers? I just tried connecting to a channel and got it’s chat stream. I can see that some of these messages have the cheer icon with them but they don’t appear to have anything particular in them that identifies that.
Would I need to fetch my auth token with a specific permission to enable the TAGS capability? I tried passing USERNOTICE command after connecting but I get a 421 message saying it’s an invalid command.