Following 2 files should be changed
www\includes\modules\pages\checkout_one\jscript_stripe.php
\www\includes\modules\pages\checkout_payment\jscript_stripe.php
from
PHP Code:
<?php
if ( isset($_SESSION['paymentIntent'])){
$_SESSION['paymentIntent'] = '';
}
?>
to
PHP Code:
<?php
$_SESSION['paymentIntent'] = '';
?>
could you check it and reply?