get_secret is a function that retrieves the secret credentials stored in the local .Renviron
file from the store_secret_credentials.
get_secret()string of the secret
get_secret should most likely never be run by the user as it is an internal function that will be
passed to other functions like get_token. Nevertheless, it may be useful for a user who wants to
check the secret that was saved in the local .Renviron file for errors. If the secret is incorrect,
the user may consider rerunning store_secret_credentials and copying and pasting the correct secret
as part of that prompt.