For internal use or for those programming around the Google API.
Returns a token pre-processed with [httr::config()]. Most users
do not need to handle tokens "by hand" or, even if they need some
control, [gar_auth()] is what they need. If there is no current
token, [gar_auth()] is called to either load from cache or
initiate OAuth2.0 flow.
If auth has been deactivated via [gar_deauth()], `gar_token()`
returns `NULL`.
Usage
gar_token()
Arguments
Value
A `request` object (an S3 class provided by [httr][httr::httr]).