Hi! Sorry for delay!
Indeed default cache is per token.
There is way to make it global, but it require creating second internal Api using Looping
Idea here is that oauth api you have will be without caching and it’s target will be our second api, smth like: tyk://api2 (since we use “looping” technique, there is no any network overhead). Your second internal api will be keyless and will have caching turned on, e.g global cache. Hope it makes sense!