Include the user displayName in extension helper
Include the displayName in the javascript helper without asking any special permision or without doing any special function (like using bits).
This value it's only available if the user send bits and the transaction get complete.
4
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Breci commented
If the person doesn't share its identity, you shouldn't have access to information allowing to identify the user. So if Twitch were to add it, it would only be available after the user shares its identity
But, not just a minority of extensions need that info and it's easy to get it by doing a simple API call.