Worldpay Business Gateway: The test mode value is invalid

-- HikaShop version -- : 4.7.2
-- Joomla version -- : 4.2.9
-- PHP version -- : 8.1.17
-- Browser(s) name and version -- : Chrome 112.0.5615.121

Trying to set up the plugin for Worldpay Business. I have set the Test Mode switch to Yes. There are several problems:-
1. The page does not automatically redirect to Worldpay.
2. The button to manually go to Worldpay has no text or image.
3. The Worldpay page (attached) says the test mode is invalid.
Worldpay support says the test mode parameter should be 0 for a live transaction, or 100 for a test.
The Debug information produced by the plugin shows testMode with the value of CAPTURED. According to the Worldpay documentation, that is one value that can be put in the Name parameter if the test mode is set to 100.
Some of the above could be down to incorrect configuration on my part (eg the button image/text as I have just left the default value in there), but I think the test mode setting is likely to be a bug in the plugin. As Worldpay want to see successful test transactions before they will allow use of the live service, this needs to be sorted out before we can move forward.

Hi Philip,
I have just sent you a message using the Contact us form. The site is guncraftltd.uk.
Thanks!

Will do.

Hi,
Unfortunately the screen photos I have been sent are not of sufficient quality to be any use, I'll try to get some better ones.
I am unsure what you mean by "the debug mode in your Worldpay method" - is this the Debug setting in the Specific Configuration section of the Worldpay Plugin? If so, it is already set to Yes.
Thanks

OK, here is the screen from the Worldpay setup:

Hi Philip,
I emailed the requested information last night, any progress?

Philip,
I have just resent the email to This email address is being protected from spambots. You need JavaScript enabled to view it.

I send the requested email almost 7 hours ago, and have heard nothing since. Please confirm that you have received it.

The worldpay server doesn't send any response because, as I said at the beginning, the request it is sent by the plugin has an error in the TestMode parameter. It cannot validate the order because there is an error in the request.
As I said at the beginning, Worldpay support have confirmed this. Of the 3 problems I identified and told you about over a week ago now, 2 of them are before the plugin even sends the order to Worldpay. As a reminder,
1. The page does not automatically redirect to Worldpay.
2. The button to manually go to Worldpay has no text or image.
3. The Worldpay page (see original post) says the test mode is invalid.
Worldpay support says the test mode parameter should be 0 for a live transaction, or 100 for a test. I am trying to perform a test transaction, as Worldpay won't enable live transactions until they see a successful series of tests.
The Debug information produced by the plugin shows testMode with the value of CAPTURED. According to the Worldpay documentation, that is one value that can be put in the Name parameter IF the test mode is set to 100.

If I knew enough about how the plugin gets stuff done I'd see about changing the testMode parameter, but I don't.

Well, It seems I know a little more about it now.
File /plugins/hikashoppayment/bf_rbsbusinessgateway/bf_rbsbusinessgateway.php:
Lines 203-206:

if (!empty($method->payment_params->testMode) ) {
			$vars['testMode'] = '100';
			$vars['testMode'] = 'CAPTURED';
		}

if (!empty($method->payment_params->testMode) ) {
			$vars['testMode'] = '100';
			$vars['name'] = 'CAPTURED';
		}

The forum editor has made a mess of the code I posted in. How do I tell it not to mess with the text?
OK, changed it now

OK, so I've found a suitable Worldpay logo to put in the button.
The remaining problems are :-
1. The plugin page doesn't automatically redirect to the Worldpay page
2. The Worldpay page doesn't send the user back to our site.
However, the order status is updated from Created to Cancelled or Confirmed depending on the result of the Worldpay page.
This would indicate to me that the interface with Worldpay is probably working correctly, but there is still a problem or problems with the Hikashop processing around the payment plugin.
I need this to be sorted out quickly, now.