you can also scrape the chat for messages from “twitchnotify”.
[message in madmikegamerxl1's channel]
twitchnotify: nate just subscribed!
twitchnotify: nate subscribed for 13 months in a row!
twitchnotify: 13 viewers resubscribed while you were away!
[message in channels hosting madmikegamerxl1's channel]
twitchnotify: nate just subscribed to madmikegamerxl1!
twitchnotify: nate subscribed to madmikegamerxl1 for 13 months in a row!
Edit: added some info from my logs.