This is a bit more than just a payment gateway as you don't need to have your own merchant account. Instead they process the transactions for you using their own merchant facilities. We've had a report that they are only accepting Canadian merchants at the moment.
It's also not a gateway that operates in the background, customers are passed over to Internetsecure to fill in their details. Finally, money collected on your behalf is delayed before being paid over to you.
Setup is pretty straight forward. Just enter you Internetsecure merchant number in Admin and hit submit. The only other thing you need to do is configure the Export Script in your Internetsecure merchant area. The settings should be;
Server Domain Name: ww#.aitsafe.com
Web page: /gen/isecure.htm
Send Approvals only: tick this box
Where ww#.aitsafe.com is the hostname you use in your Buy Now links to the cart.
URL to this page: https://www.mals-e.com/tpv.php?tp=14