Sagepay password server integration.
I have successfully used SagePay form integration on a recent job with no problem, but when I try and use server integration, I am getting a failed transaction and I am sure this is going to mainly be because I cannot find where I have to put my encryption password!
On the form integration, I can see that the encrpytion password is put in on confirm.php in the following line:
<?php echo WA_Protx_VSPFormHash($eCart1, "2F7JamwcD45sJDKD", (no, this isn't a real password BTW ;-).)
But where on earth do I put this on the server integration version? I have looked through everything and cannot seem to find where I do this, please help as I am lost!