In this case it is very likely that the URL you returned as a response to the payment result message posted to your system is not valid.

The payment confirmation page contains a Javascript-Snippet similar to the following:

function gotoMerchantSite()


parent.location.href = “”


The URL that is used in this method is the one we receive back from you after posting the payment result to your response URL.

If this URL is not valid (or contains “”) it is possible that you will get a Javascript error.