Im not actually getting any reponse just an error at Sagepay.
The Post values are:
<input type="hidden" name="Vendor" id="Vendor" value="theaudioworksuk" />
<input type="hidden" name="VPSProtocol" id="VPSProtocol" value="2.23" />
<input type="hidden" name="TxType" id="TxType" value="PAYMENT" />
<input type="hidden" name="Crypt" id="Crypt" value="NBxcICpEEy8bJVEce0J5VVdAB3d0A3RuaWx0FCkGJRVfTgZ9awZ3cRs/RwsjHSgYXz5wFGNyIiQ7OFwJMhokD19IAHBwD3JkaX8GQHdVGBQBGlc3NmMVG2UiQQ02SWRODhZRJSleKCQsZXQMIhokNg0LWTdqVS8yOyFaDDIsOBQBGlc3Nhg3PyhscxgvHz4TByxgCHheMyMocBpWKhwoAA4RXTcxGQYiPCNaLikBIBJNGlohJl0oIiwVUxgvHz4TB1dCLDUQBTYrIVANe0JxLSdZfwUMYhUSeAdjKmYjGS5CMXMeAGR9ZmJsRRYzHS9aVU0LanUGfW1+OloMKBdwVlZAHHR1DGEnNz9bHX1Ef1hMSQI=" />
<input type="button" value="Modify information" onclick="history.back();return false;"/><input type="submit" name="Submit_order" id="Submit_order" value="Checkout" />
</td>
THE ERROR AT SAGEPAY IS
VPSProtocol=2.23
Status=MALFORMED
StatusDetail=3045 : The Currency field is missing.
I added the currency field as a hidden form value and cleared the error but each time I did this asked for something else like description, amount etc, basically everything that should be included in the Crypt is missing