Guest Payment Not Working

Hi @mattwire !

I am having problems with Payment when using Stripe. Everything was fine before I updated to the latest version CiviCRM 5.27.2 and Stripe Payment Processor 6.4.2.

When the user logs in, the payment function works, but the Guest will not be able to donate. It will have an error message:

Error 500: https://www.domain.com/civicrm/stripe/confirm-payment

message:            Authorization failed
code:               
exception:          Civi\API\Exception\UnauthorizedException Object
(
    [extraParams:API_Exception:private] => Array
        (
            [error_code] => unauthorized
        )

    [message:protected] => Authorization failed
    [string:Exception:private] =>
    [code:protected] => 0
    [file:protected] => sites/all/modules/civicrm/Civi/API/Kernel.php
    [line:protected] => 227

Do you have any ideas on how to fix this problem?