Thanks for your reply.

I managed to get it working using the merchant hosted model. However for the life of me can't get it working using the server hosted model? Have any of you guys managed to get it working with the server hosted model?

Also I noticed with the merchant hosted model, if for whatever reason the credit card info is wrongly supplied it tries to redirect you back to the site but ends up at the migs screen with an error (i notice that there is no merchant name there)??? very weird..