I'm sorry, but the knowledge sources provided do not contain information on how to retrieve a user's ID using their token subject ("sub"). The process to do this can vary greatly depending on the specific service or API you are interacting with.
In general, you would need to make an authenticated request to the service's API, passing the token as part of the authorization header. The API should then return the user's information, including their ID. However, this is a general approach and might not apply to all services.
I would recommend checking the specific service's API documentation for accurate information on how to retrieve a user's ID using their token subject.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: