there is NO WAY that ANY Hikashop user with Authorize.net can show their customer a receipt page for their order when using guest checkout
I've never said that this was false.
This is completely true.
What I said is that the guest checkout works with authorize.net, that's it. If you want a different receipt page, it requires customization. I've said that from the beginning and it's still true.
With the guest checkout and the authorize.net (or any other payment methods), your customers won't see their order details after the checkout. They'll see a thank you page with just a standard message. If you enter a return URL in the plugin to go the order details page, the system won't allow you to do that because there is a check on the user account so that only logged in users can access their order page. The modification I gave you in the other thread is to allow you to lift that check so that you can use that URL to their order page as return URL in the authorize.net payment method, without modifying any code in the plugin.
At no point did you tell us that you had configured the payment method like that with the modification I gave you in the controller to left the check on the order details page and that it wasn't working. So yes, I don't see a point in doing a test when I know that it can't work already the way you configured it. It's impossible that the orders would be confirmed with the x_relay_url being set to FASLE in the code of the plugin. It is critical that the payment notification URL is set in that parameter for the payment plugin to be notified of the payments in order to confirmed the orders. I don't need to test your checkout to tell you that this modification shouldn't be done.
Please ask for a refund through our contact form. We'll be happy to refund you. There is no point is discussing this further with you since you seem to only want to argue for the sake of arguing instead of trying to move forward.