Before you can use Realex’s Realauth Redirect, you must first provide Realex with the URL of your callback page. This should be:

http://www.demo.xyz/Callback-Realex.aspx

(this is URL-mapped to the Callback.aspx file by Kartris)

The response URL is to be mailed to support@realexpayments.com. You can also have an HTML template uploaded to the Realex Payment servers so that the redirection should resemble the rest of the shopping experience (or else it will use Realex’s default template). You can send your template to them via same email address. For further info, check the Realex developer's guide.

In case Realauth is unable to contact your callback page, you can set a static success/failure message. This can be done at Realex's administration web site (Realex will have supplied you with access details).