-- | The identification number of the MFA device that is associated with the
-- IAM user who is making the 'GetSessionToken' call. Specify this value if
-- the IAM user has a policy that requires MFA authentication. The value is
-- either the serial number for a hardware device (such as 'GAHT12345678')
-- or an Amazon Resource Name (ARN) for a virtual device (such as
-- 'arn:aws:iam::123456789012:mfa\/user'). You can find the device for an
-- IAM user by going to the AWS Management Console and viewing the user\'s
-- security credentials.
gstSerialNumber :: Lens' GetSessionToken (Maybe Text)
gstSerialNumber = lens _gstSerialNumber (\ s a -> s{_gstSerialNumber = a})
gstSerialNumber :: Lens' GetSessionToken (Maybe Text)
gstSerialNumber = lens _gstSerialNumber (\ s a -> s{_gstSerialNumber = a})
gstSerialNumber = lens _gstSerialNumber (\ s a -> s{_gstSerialNumber = a})