Hi,

    i will try to run this class, i got an error like   <?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><CreateCustomerProfileResponse xmlns="https://api.authorize.net/soap/v1/"><CreateCustomerProfileResult><resultCode>Error</resultCode><messages><MessagesTypeMessage><code>E00007</code><text>User authentication failed due to invalid authentication values.</text></MessagesTypeMessage></messages><customerProfileId>0</customerProfileId></CreateCustomerProfileResult></CreateCustomerProfileResponse></soap:Body></soap:Envelope>

Public class callExternalWS 
    { 
        public void invokeExternalWs() 
        { 
            HttpRequest req = new HttpRequest(); 
            //Set HTTPRequest Method 
            req.setMethod('POST'); 
            req.setEndpoint('https://api.authorize.net/soap/v1/Service.asmx'); 
            req.setMethod('POST'); 
            req.setHeader('Content-Type', 'text/xml; charset=utf-8'); 
            req.setHeader('SOAPAction', 'https://api.authorize.net/soap/v1/CreateCustomerProfile'); 
            string b =   '<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">'+ 
                          '<soap:Body><CreateCustomerProfile xmlns="https://api.authorize.net/soap/v1/">'+ 
                          '<merchantAuthentication><name>8j4W5UyB</name>'+ 
                          '<transactionKey>7mR2ah8655gLSR8q</transactionKey></merchantAuthentication>'+ 
    '<profile><description>description</description>'+ 
                          '<email>sforce2009@gmail.com</email>'+ 
                          '<paymentProfiles>'+ 
                          '<CustomerPaymentProfileType><customerType>individual</customerType>'+ 
    '<payment><creditCard><cardNumber>6011000000000012</cardNumber>'+ 
                          '<expirationDate>2009-12</expirationDate></creditCard>'+ 
                          '</payment></CustomerPaymentProfileType></paymentProfiles></profile>'+ 
                          '</CreateCustomerProfile></soap:Body></soap:Envelope>'; 
            req.setBody(b); 
            Http http = new Http(); 
            try { 
              //Execute web service call here        
              HTTPResponse res = http.send(req);    
              //Helpful debug messages 
              System.debug(res.toString()); 
              System.debug('STATUS:'+res.getStatus()); 
              System.debug('STATUS_CODE:'+res.getStatusCode()); 
              System.debug('STATUS_CODE:'+res.getBody()); 
            //YOU CAN ALWAYS PARSE THE RESPONSE XML USING XmlStreamReader  CLASS 
           } catch(System.CalloutException e) { 
                //Exception handling goes here.... 
         }        
    } 
    }

 thanks

sravani