I have implemented Authorize.Net payment gateway in one of the website and we have the "Authorize.Net stamp" placed on the order confirmation page. When we click on this stamp, we get the error message saying "Unable to verify this site as an Authorize.net merchant" as you can see in the image here. One probable reason could be configuration of merchant account, which I think is configured properly. Still I don't understand why this problem is coming. Has anyone come across such problem? Please let me know what do you think could be the reason for this problem and how to remove this error.