VirtualMerchant payment plugin debug for "An error occured"

-- url of the page with the problem -- : simcoecurlingclub.ca/online-proshop/checkout
-- HikaShop version -- : 4.4.3
-- Joomla version -- : 3.10.1
-- PHP version -- : 7.4.11
-- Browser(s) name and version -- : Chrome 93.0.4577.63
-- Error-message(debug-mod must be tuned on) -- : An error occurred.

Using the HikaShop VirtualMerchant payment plugin. The Merchant ID, User ID and pin were copied and pasted, check for spaces before and after.

Site already has a custom payment using this merchant ID, with user ID ad pin. Also has an event registration that has a virtualmerchant payment plugin with this exact same info set for Live and it has been tested and working.

I have access to Converge to see any transactions, or access the accounts with pin and so far no transaction attempts.

Turned debug on joomla, system debug plugin so can see the debug console as well. Debug turned on in the VirtualMerchant payment plugin settings. Nothing is displayed other than once the credit card info is entered the info is accepted and then after processing the "An error occured" is at the top of the checkout.

I have tried with the "debug" setting of the payment methold. Toggled on or off makes no difference.
As for connections, the same site has VirtualMerchant processing 2 other payment plugins, for membership and one for event registration. They use the same merchant ID, username and pin and have been tested working.

And any debug settings show no communcation information, just the friendly error. Debug console in Joomla shows nothing of interest either.

Thanks for that info! That is what I was looking for is a log to help.

Unfortunately the log is not populated.

UPDATE

I happened to read more with this virtualmerchant plugin and the debug doesn't really show much. I found out that I needed to exit out of the processing to see what was being received.

Don't you have other debug message on the page since you have the debug option turned on ?
Normally, it should display more things.
If not, change the line:
echo print_r($ret, true)."\n\n\n";
to:
echo print_r($ret, true)."\n\n\n";exit;

in plugins/hikashoppayment/virtualmerchant/virtualmerchant.php and that will display the return data from the payment gateway on a blank page and that should include the error message epxlaining what's wrong.

This worked great! I found out right away that it was failing on address submitted. I did not realize that hikashop even though the login is from CB would not pull anything. I just assume the point of login was to share profile data and not just the authentication.

Once I added the address option to checkout, I could see it works. Flipside I could remove the requirement for address from the merchant, but having that billing info might be good and it effects the other plugins that do submit the address.

The test came back valid so I will process a payment tomorrow and then can have a working shop! Appreciate the replies as they helped keep me researching the problem