//Conga_Webservice_Config__c
@TestVisible
public static string CongaCallout(string payload, string endpoint){

    system.debug('===Payload: '+payload);
    string calloutResponse = '';

    HttpRequest myRequest = new HttpRequest();
    Http myRequestHttp = new Http();
    myRequest.setHeader('Content-Type', 'text/xml;charset=UTF-8');
    myRequest.setHeader('SOAPAction','DoesNotMatter');
    myRequest.setMethod('POST');
    myRequest.setEndpoint(endpoint);  // This line cause to error
    myRequest.setBody(payload);
    myRequest.setTimeout(30000);//set timout for 30 seconds
    try{
        HttpResponse myResponse = myRequestHttp.send(myRequest);
        calloutResponse = myResponse.getBody();
        //system.debug('=== calloutResponseStatus: '+myResponse.getStatusCode());
        if(myResponse.getStatusCode() != 200)
        ErrorLogExt.LogInfo(
            'wwwRestConnector',
            'CongaCallout',
            'Callout Response Status ' + myResponse.getStatusCode() + ' Payload: '+myRequest + '   --   ' + payload);
        system.debug('=== calloutResponse: '+calloutResponse);

        return calloutResponse;
    }catch(exception e){
         ErrorLogExt.LogException('wwwRestConnector','CongaCallout',e);
    }
     return null;
}


  Conga_Webservice_Config__c cs = Conga_Webservice_Config__c.getOrgDefaults();
    string endpoint = cs.Conga_Endpoint__c;
    string OutMessageID;

    if (CongaCalloutName == cpp_CustomerSurveyComplete) {
        system.debug('if clause');
        OutMessageID = cs.CalloutCongaCustomerSurveyCompletedId__c;
    } else if (CongaCalloutName == cpp_NotifyPartner) {
        system.debug('else if clause');
        OutMessageID = cs.CalloutCongaNotifyPartner__c;
    }

    system.debug('CongaCalloutName = ' + CongaCalloutName);
    system.debug('warrantyID = ' + warrantyID);
    system.debug('CongaURLCerttoEndUser = ' + CongaURLCerttoEndUser);
    system.debug('CongaURL = ' + CongaURL);
    system.debug('sessionId = ' + sessionId);


    system.debug('endpoint = ' + endpoint);
    system.debug('outmessage = ' + OutMessageID);
    string res = '';
    res = CongaCallout(buildXMLCongaPayload(CongaCalloutName, warrantyID, CongaURLCerttoEndUser, CongaURL, OutMessageID, sessionId), endpoint );  // This line cause error.
    //return res;
    system.debug(res);




}