Marketpress Payment Processor - Canada

Hello, just trying to get the payment processing portion of the Marketpress application configured, and am having some difficulty.

I believe there are specific instructions to enable WePay for Canadian customers (i.e. I am getting a "Postal Code is required" response from the submission), but I was unable to come across how to modify the application on the site to function.

Can you let me know what is happening with the error shown and how I can take steps to resolve it?

Thanks in advance