payer auth verifier causes session timeout error

[DigitalShadow]

[02-Sep-2020 13:45:50 Europe/London] Request URI: /index.php?main_page=payer_auth_verifier, IP address:
#1 session_id() called at [/home/site/public_html/includes/modules/pages/payer_auth_verifier/header_php.php:55]
#2 require(/home/site/public_html/includes/modules/pages/payer_auth_verifier/header_php.php) called at [/home/site/public_html/index.php:36]
--> PHP Warning: session_id(): Cannot change session id when session is active in /home/site/public_html/includes/modules/pages/payer_auth_verifier/header_php.php on line 55.

1.5.6c PHP Version: 7.3.21

I've verified the bug myself and also verified that the bug doesn't happen 100% of the time.

When clicking the final stage to confirm, the verifier page fails with a session timeout error.

When attempting payment via paypaldp I get the error.

[DigitalShadow]

// Get the MD back and set it as the session id

  if (isset($_REQUEST["MD"]) && $_REQUEST["MD"] != null && strlen($_REQUEST["MD"]) != 0) {

    session_id($_REQUEST["MD"]);

  }

[DigitalShadow]

when watching in "whos online" you can see that the customer session dies and they become a guest on that page.

[DigitalShadow]

Can I also mention that the firing of this warning does not result in a failure.

I can see that the warning is being given for successful sales, but i can also confirm that there is an issue somewhere.

After clicking the final confirm button, the stage where the card check takes place, during this check, a session timeout error is shown, not sure of cause.

[kalm]

I have the similar issue. Time out after payment, customer session becomes a guest session.
https://www.zen-cart.com/showthread....eckout_success

[DigitalShadow]

Your problem is different, this problem causes the transaction to fail before completion.

[mc12345678]

Would the store still be able to operate if PayPal Express were instead used? Or rather what problems would the store have if operated using PayPal Express?

[DigitalShadow]

I use both, i use paypaldp for on site card payments, 40% of transactions are done using card on the site.

[DigitalShadow]

So far all logged issues have been with users using chrome, from version 83 to 85.

Also, I don't believe the issue was happening when I used the paypal payment code from before 1.5.5

I had been using the paypal code from version 1.5.4 due to a problem with payflow UK and the newer paypal code.

See this thread

I have only had this problem since no longer using the 1.5.4 code.

I managed to use the 1.5.6c paypal code by switching PayPal Express Checkout PayPal mode from Payflow-UK to PayPal. This has got round the problems in the thread above, but has now introduced a problem with the onsite payments.

I believe both issues are linked.

Please DrByte, look into this.

[DigitalShadow]

I've implemented the changes to my 1.5.6c site as mentioned by lat9 on this thread

Waiting to see if any improvement to the situation is seen.