HTTP/1.1 200 OK
Date: Fri, 17 Apr 2015 02:22:45 GMT
Server: Apache
Content-Type: text/xml;charset=ISO-8859-1
Content-Length: 194
Connection: close

<?xml version="1.0" encoding="UTF-8" standalone="no"?><SecurePayMessage><Status><statusCode>504</statusCode><statusDescription>Invalid merchant ID</statusDescription></Status></SecurePayMessage>