Using with Marketpress


I’m using on Marketpress. I have setup the Login ID, Transaction ID, and MD5 Hash (I’ve done this previously with another cart without issue). On checkout I get the following error:

“Oops! An error occurred while processing your payment.

There was a problem finalizing your purchase. Please go back and try again.”

I am wondering how to debug this issue so that I can resolve it.

I have assigned login permissions to the multisite. The cart is active on

I setup a $1 test transaction here:

I used a valid credit card when I received the error.

I looked in the backend to see if there is any error log for the cart but I couldn’t find anything.