[eluser]Unknown[/eluser]
I'm having the same problems.
After getting the white screen I added
Code:
ini_set('display_errors',1);
and saw that it needed the language helper, so I added that with
Code:
$this->load->helper('language');
.
Now I'm getting an error: Missing argument 1 for Merchant::purchase_return().
I'm not even sure if I should be calling this as the comment mentions hosted payment gateways only?