Obviously, we’re talking about different things.
I tried to explain what my example was about: A loyalty extension that rewards viewers by donating items to them. You seem to keep asking me about implementation details for a viewer-to-streamer donation extension which is not what my example was about. So I am sorry, I cannot give any clarification for that because it’s something different. Of course for the thing you keep asking about some kind of viewer authentication is required.
You may as well want to create a new topic for that or continue the conversation outside this thread before it gets too off-topic if you want to know more about the way to go for the extension you are looking to build. 