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Hmmm... when I verified my files against one_page_checkout-2.3.7.zip, my OnePageCheckout.php was a match. Here is line 2323 from my OnePageCheckout.php:

trigger_error("Unknown/invalid billto...

You fixed it. Not the file reporting the error, but my tpl_modules_opc_shopping_cart.php was two characters shorter than the one contained in one_page_checkout-2.3.7.zip. I don't know why, and...

@lat9,
The database entries you refer to look like they are lined up correctly. The three configuration key values:

mysql> select configuration_id,configuration_key,configuration_value from...

Here is the Request URI from the log
[14-Apr-2021 14:29:42 America/Los_Angeles] Request URI: /ipn_main_handler.php?type=ec, IP address: <my.ip.add.ress>

Sorry I omitted the OnePage version. In the zen cart configuration it is reported as 2.3.7-beta2 (2021-01-17). I downloaded it from the "Download Latest" button at...

I have upgraded my ZenCart 1.5.6 site to 1.5.7c by doing a clean install of 1.5.7c, manually upgrading my custom template files using the 1.5.7c core files, and reinstalling the OnePageCheckout...