For the purposes of GDPR it would be useful to have the following webhooks:

• When a Streamer installs an extension
• When a streamer activates an extension
• When a streamer deactivates an extension
• When a streamer uninstalls an extension.

The most important one is the uninstall, it allows us the third party to be notified of an uninstalled.

The Shopify platform has this with the rule that a third party should, automatically delete all Store (and that stores customer data) 30 days after that hook triggers.

We need/should do the same, delete any broadcaster, or broadcaster viewer (and subscribers) data 30 days after the uninstall. (The 30 days allow for the broadcaster to reinstall the extension and avoid the caster having to re-setup the extension, when talking about any configuration, and hence the need for the install hook to go hand in hand)

Activate/deactivate are useful for the purpose of turning on/off any backend services related to the extension, couple that with https://twitch.uservoice.com/forums/310213-developers/suggestions/37563622-live-activated-channels-w-extension-webhook for video extensions to improve accuracy of whose live and who needs backend service support.