As long as the Token is for the correct type and with the relevant scopes and with correct permissions from the casters you wish to collect.
You’ll need an Access Token from the channel/users that you intend to collect, you can’t get my leaderboard, without permission/an access key from me
Again, the extensions/transactions endpoint is JUST FOR YOUR OWN EXTENSIONS THAT YOU ARE A DEVELOPER OF, given this thread I don’t think you’ve built and released an extension that is using bits yet. I included it for completeness