The BearerToken property specifies the OAuth 2.0 bearer
token used to authenticate the user. Assigning a value to this property will change the current
authentication method to use OAuth 2.0 if necessary.
Your application should not store a bearer token for later
use. They have a relatively short lifespan, typically about an hour, and
are designed to be used with that session. You should specify offline
access as part of the OAuth 2.0 scope if necessary and store the refresh
token provided by the service. The refresh token has a much longer
validity period and can be used to obtain a new bearer token when needed.
If the current authentication method does not use OAuth 2.0, this
property will return an empty string and you should check the
value of the Password property to obtain the
current user's password. Refer to the AuthType
property for more information on the available authentication methods.