Authorize.net problem

I'm using Authorize.net with a remote checkout set-up. After confirming the order on Authorize.net, I get this error message: "Send back 403 response 1ERROR: Nothing parsed, nothing printed"

The order, however, does seem to go through - I get the confirmation and details are stored in the database.

Can you help me figure out what's going wrong?

Thanks - Joe

the 403 response means the access is denied.

Is this showing on a page at authorize.net?

or on a page of your site?

I cant find a lot of details, honestly, but the ERROR: "Nothing parsed, nothing printed" seams to be pop up in searches mostly in conjunction with templates from FastTemplates

The error is on a page on my site that is called from Authorize.net's designated response/receipt page via a form action.

Yes, I'm trying to integrate eCart with an existing system that was set up with some template system. I'm wondering if that may even be possible now. What would I do if I wanted to just use the eCart pages? The key seems to be Authorize.net's Response/Receipt URLs. Which page(s) should I set that URL to for eCart to complete the order?

use the checkout_success page created by the checkout wizard.

With the Authorize.net system, you can add multiple URLs to their Response/Receipt URLs section - do I also add checkout_failure.php page there or is that called from checkout_success?

the checkout failure page should only be called when the checkout fails.