One-Page Checkout [Support Thread]

[bumba000]

We are running zc 2.2.2 on php 8.2 and opc 2.6.2 now with some modsecurity rules disabled. most folks having no problem now, but we just had another that for some reason got a 500 server error during checkout. placed an order twice and still had the items in his cart. Is this possibly a common issue? Would it be resolved by upgrading to the 2.6.3 version. Also this is all with authorize aim.

If I'm to upgrade, should I just overwrite existing files, or is there db stuff as well? Should I use the plugin manager to uninstall and re-install?

Thank you,
John

[lat9]

FYI,

Files come down as 4.6.3 vs 2.6.3

Thanks for that; the upload's been corrected.

[lat9]

We are running zc 2.2.2 on php 8.2 and opc 2.6.2 now with some modsecurity rules disabled. most folks having no problem now, but we just had another that for some reason got a 500 server error during checkout. placed an order twice and still had the items in his cart. Is this possibly a common issue? Would it be resolved by upgrading to the 2.6.3 version. Also this is all with authorize aim.

If I'm to upgrade, should I just overwrite existing files, or is there db stuff as well? Should I use the plugin manager to uninstall and re-install?

Thank you,
John

OPC is not yet an "encapsulated" plugin, so the "Plugin Manager" doesn't participate in its installation/removal. You'll need to use the just published v2.3.6, which corrects a couple of issues.

OPC's readme.html identifies how to install/upgrade.

[njcyx]

zc210. opc2.6.3

I just received the following warning. It is my first time to see this warning.

[29-Jul-2026 13:49:45 America/New_York] Request URI: /index.php?main_page=checkout_one, IP address: xxxx, Language id 1
#0 /includes/templates/template_default/templates/tpl_modules_opc_address_block.php(157): zen_debug_error_handler()
#1 /includes/templates/template_default/templates/tpl_modules_opc_billing_address.php(14): require('/')
#2 /includes/templates/template_default/templates/tpl_checkout_one_default.php(60): require('/')
#3 /includes/templates/responsive_classic/common/tpl_main_page.php(187): require('/')
#4 /index.php(94): require('/')
--> PHP Warning: Undefined array key "telephone" in /includes/templates/template_default/templates/tpl_modules_opc_address_block.php on line 157.

Line 157 is the following.

<?= zen_draw_input_field('telephone[bill]', $address['telephone'], $telephone_field_length . ' id="telephone" class="phone" placeholder="' . ENTRY_TELEPHONE_NUMBER_TEXT . '"' . $telephone_required, 'tel') ?>

[lat9]

zc210. opc2.6.3

I just received the following warning. It is my first time to see this warning.

[29-Jul-2026 13:49:45 America/New_York] Request URI: /index.php?main_page=checkout_one, IP address: xxxx, Language id 1
#0 /includes/templates/template_default/templates/tpl_modules_opc_address_block.php(157): zen_debug_error_handler()
#1 /includes/templates/template_default/templates/tpl_modules_opc_billing_address.php(14): require('/')
#2 /includes/templates/template_default/templates/tpl_checkout_one_default.php(60): require('/')
#3 /includes/templates/responsive_classic/common/tpl_main_page.php(187): require('/')
#4 /index.php(94): require('/')
--> PHP Warning: Undefined array key "telephone" in /includes/templates/template_default/templates/tpl_modules_opc_address_block.php on line 157.

Line 157 is the following.

<?= zen_draw_input_field('telephone[bill]', $address['telephone'], $telephone_field_length . ' id="telephone" class="phone" placeholder="' . ENTRY_TELEPHONE_NUMBER_TEXT . '"' . $telephone_required, 'tel') ?>

I'm seeing how to "patch" this, but I'm having a hard time determining where the 'telephone' element of the billing address disappeared to.

[bumba000]

Our multiple checkouts without clearing the cart contents have been resolved. https://www.zen-cart.com/showthread....54#post1412054

[njcyx]

zc210. opc2.6.3

I just received the following warnings. It is my first time to see this warning.

1st.

[06-Aug-2026 18:36:10 America/New_York] PHP Notice: unknown 'bill' address_book_id (15xxxx) for customer_id (109528) in /includes/classes/OnePageCheckout.php on line 1241

109528 is the OPC generated customer in my site. Line 1241 is the following.

trigger_error("unknown '$which' address_book_id ($address_book_id) for customer_id (" . $_SESSION['customer_id'] . ')', E_USER_NOTICE); 

2nd. Same time as 1st.

[06-Aug-2026 18:36:10 America/New_York] Request URI: /index.php?main_page=checkout_one, IP address: xxxx, Language id 1
#0 /includes/classes/OnePageCheckout.php(1250): zen_debug_error_handler()
#1 /includes/classes/OnePageCheckout.php(1214): OnePageCheckout->getAddressValuesFromDb()
#2 /includes/templates/template_default/templates/tpl_modules_opc_address_block.php(24): OnePageCheckout->getAddressValues()
#3 /includes/templates/template_default/templates/tpl_modules_opc_billing_address.php(14): require('/...')
#4 /includes/templates/template_default/templates/tpl_checkout_one_default.php(60): require('/...')
#5 /includes/templates/responsive_classic/common/tpl_main_page.php(187): require('/...')
#6 /index.php(94): require('/...')
--> PHP Warning: Attempt to read property "fields" on array in /includes/classes/OnePageCheckout.php on line 1250.

[06-Aug-2026 18:36:10 America/New_York] Request URI: /index.php?main_page=checkout_one, IP address: xxxx, Language id 1
#0 /includes/classes/OnePageCheckout.php(1250): zen_debug_error_handler()
#1 /includes/classes/OnePageCheckout.php(1214): OnePageCheckout->getAddressValuesFromDb()
#2 /includes/templates/template_default/templates/tpl_modules_opc_address_block.php(24): OnePageCheckout->getAddressValues()
#3 /includes/templates/template_default/templates/tpl_modules_opc_billing_address.php(14): require('/...')
#4 /includes/templates/template_default/templates/tpl_checkout_one_default.php(60): require('/...')
#5 /includes/templates/responsive_classic/common/tpl_main_page.php(187): require('/...')
#6 /index.php(94): require('/...')
--> PHP Warning: foreach() argument must be of type array|object, null given in /includes/classes/OnePageCheckout.php on line 1250.

[06-Aug-2026 18:36:10 America/New_York] PHP Fatal error: Uncaught Error: Attempt to modify property "fields" on array in /includes/classes/OnePageCheckout.php:1268
Stack trace:
#0 /includes/classes/OnePageCheckout.php(1214): OnePageCheckout->getAddressValuesFromDb(154952, 'bill')
#1 /includes/templates/template_default/templates/tpl_modules_opc_address_block.php(24): OnePageCheckout->getAddressValues('bill')
#2 /includes/templates/template_default/templates/tpl_modules_opc_billing_address.php(14): require('/...')
#3 /includes/templates/template_default/templates/tpl_checkout_one_default.php(60): require('/...')
#4 /includes/templates/responsive_classic/common/tpl_main_page.php(187): require('/...')
#5 /index.php(94): require('/...')
#6 {main}
thrown in /includes/classes/OnePageCheckout.php on line 1268

[06-Aug-2026 18:36:10 America/New_York] Request URI: /index.php?main_page=checkout_one, IP address: xxxx
--> PHP Fatal error: Uncaught Error: Attempt to modify property "fields" on array in /includes/classes/OnePageCheckout.php:1268
Stack trace:
#0 /includes/classes/OnePageCheckout.php(1214): OnePageCheckout->getAddressValuesFromDb(154952, 'bill')
#1 /includes/templates/template_default/templates/tpl_modules_opc_address_block.php(24): OnePageCheckout->getAddressValues('bill')
#2 /includes/templates/template_default/templates/tpl_modules_opc_billing_address.php(14): require('/...')
#3 /includes/templates/template_default/templates/tpl_checkout_one_default.php(60): require('/...')
#4 /includes/templates/responsive_classic/common/tpl_main_page.php(187): require('/...')
#5 /index.php(94): require('/...')
#6 {main}
thrown in /includes/classes/OnePageCheckout.php on line 1268.

[06-Aug-2026 18:36:10 America/New_York] Request URI: /index.php?main_page=checkout_one, IP address: xxxx
--> PHP Fatal error: Uncaught Error: Attempt to modify property "fields" on array in /includes/classes/OnePageCheckout.php:1268
Stack trace:
#0 /includes/classes/OnePageCheckout.php(1214): OnePageCheckout->getAddressValuesFromDb(154952, 'bill')
#1 /includes/templates/template_default/templates/tpl_modules_opc_address_block.php(24): OnePageCheckout->getAddressValues('bill')
#2 /includes/templates/template_default/templates/tpl_modules_opc_billing_address.php(14): require('/...')
#3 /includes/templates/template_default/templates/tpl_checkout_one_default.php(60): require('/...')
#4 /includes/templates/responsive_classic/common/tpl_main_page.php(187): require('/...')
#5 /index.php(94): require('/...')
#6 {main}
thrown in /includes/classes/OnePageCheckout.php on line 1268.

Line 1250 is the following

foreach ($address_info->fields as $key => $value) { 

Line 1268 is the following.

$address_info->fields['telephone'] = $telephone->fields['customers_telephone'] ?? ''; 

Not sure if it is related to the warning I found by the end of last month.

[lat9]

That's yet-another issue, that indicates that somehow (?) the guest-customer's bill-to address book id is corrupt. Are both the bill-to and ship-to address book records present for that guest customer id?