The logs below look fine, what you're seeing there is the initial request to our system, followed by the redirect we send back to send the customer to the Interac system. This is all working from what I can see, and a test I did up to the Interac login page worked as well. This indicates that the urls are correct as well.
Without being able to do a live test it's hard to see exactly what the error that Zencart is capturing, the screenshot indicates there was an error but does not show the actual error from our response, which would have an ID and a message associated with it.
What I would recommend is making a post on the Zencart support forum describing the issue, as it sounds like there's some sort of problem with the module itself, or perhaps the configuration of it. Ask if there's any additional logging happening that you could send to us, or any way to see the actual error response from our system on the 2nd part of the transaction. The person that created the module posts under the name "swguy" on the forums, he's likely to respond if you're looking for assistance with it.
If you can get additional information from the Zencart logs or a more specific error message then we can look further into it, unfortunately with the information provided I don't see anything wrong with the setup on our end or with the actual IOP url setup.
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