How to debug 403 errors that occur only with specific types of checkout

Hi,

We’re encountering a strange error on the site that only happens when a customer attempts to submit an order using the guest option (no checkout) and using a gift card that covers the entire amount.

When they hit submit, they are shown a 403 error saying:

You don’t have permission to access the page.
Error code: Access denied

If they create an account, then they are able to place the order.

My question is about how I could debug this to track the source of the error. Are there any logs that exist to record source of 403 errors like this?

I did enable DEBUG_MODE AND DEVELOPMENT_MODE using the instructions here Configuring CS-Cart — CS-Cart 4.18.x documentation and can see the debugger sidebar with its various tabs, but nothing there seems to stand out.

Any pointers would be greatly appreciated.

Hi!

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