(optional) String identifying the application. This string is displayed to end users on Google's authorization confirmation page. For registered applications, the value of this parameter overrides the name set during registration and also triggers a message to the user that the identity can't be verified. For unregistered applications, this parameter enables them to specify an application name, In the case of unregistered applications, if this parameter is not set, Google identifies the application using the URL value of oauth_callback; if neither parameter is set, Google uses the string anonymous.