Returns the current prepaid balance for the user, both in raw units and a formatted string.
Use this to determine whether a user can afford new API requests or needs a top-up.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Optional user identifier provided by the developer.
Can be used instead of the user property in the request body to associate the API call with a specific end user.
The unique identifier of the user to get balance information for.