Como pegar Resultado de um webservice ?

Pessoal, estou me batendo a alguns dias, pois nao estou conseguindo implementar esta solucao, estou precisando enviar as informacoes do usuario para um service de entrega aqui nos EUA chamado UPS, eu quero pegar o valor total que ira custar para enviar uma mercadoria, e para um site de e-commerce, o problema e que meu chefe nao quer utilizar XML, estou utilizando o SOAP, por favor estou tentando passer os dados de requisicao via Ajax assim:

 var url = 'https://wwwcie.ups.com/webservices/Rate';

 $.ajax({
 url : url,
 type : 'post',
 contentType : 'text/xml',
 dataType : 'xml',
 data : 'SoapRateClient.php',
 success : processSuccess,
 error : processError

 });

O SoapRateClient. php e assim:

//Configuration

 $access = "8C5994D151D8F8A0";
 $userid = "";
 $passwd = "";
 $wsdl = "upsWSDL/RateWS.wsdl";
 $operation = "ProcessRate";
 $endpointurl = "https://wwwcie.ups.com/webservices/Rate";
 $outputFileName = "XOLTResult.xml";

 function processRate()
 {
 //create soap request
 $option['RequestOption'] = 'Shop';
 $request['Request'] = $option;

 $pickuptype['Code'] = '01';
 $pickuptype['Description'] = 'Daily Pickup';
 $request['PickupType'] = $pickuptype;

 $customerclassification['Code'] = '01';
 $customerclassification['Description'] = 'Classfication';
 $request['CustomerClassification'] = $customerclassification;

 $shipper['Name'] = 'Ricardo Scarpim';
 $shipper['ShipperNumber'] = '5Y873F';
 $address['AddressLine'] = array
 (
 '454 MAIN ST',
 'FORT LEE, NJ',
 'SUITE 6'
 );
 $address['City'] = 'harrison';
 $address['StateProvinceCode'] = 'NJ';
 $address['PostalCode'] = '07029';
 $address['CountryCode'] = 'US';
 $shipper['Address'] = $address;
 $shipment['Shipper'] = $shipper;

 $shipto['Name'] = 'Imani Imaginarium';
 $addressTo['AddressLine'] = '21 ARGONAUT SUITE B';
 $addressTo['City'] = 'ALISO VIEJO';
 $addressTo['StateProvinceCode'] = 'CA';
 $addressTo['PostalCode'] = '92656';
 $addressTo['CountryCode'] = 'US';
 $addressTo['ResidentialAddressIndicator'] = '';
 $shipto['Address'] = $addressTo;
 $shipment['ShipTo'] = $shipto;

 $shipfrom['Name'] = 'Imani Imaginarium';
 $addressFrom['AddressLine'] = array
 (
 'Southam Rd',
 '4 Case Court',
 'Apt 3B'
 );

 $addressFrom ['City'] = 'Timonium';
 $addressFrom ['StateProvinceCode'] = 'MD';
 $addressFrom ['PostalCode'] = '21093';
 $addressFrom ['CountryCode'] = 'US';
 $shipfrom ['Address'] = $addressFrom;
 $shipment ['ShipFrom'] = $shipfrom;

 $service ['Code'] = '03';
 $service ['Description'] = 'Service Code';
 $shipment ['Service'] = $service;

 $packaging1 ['Code'] = '02';
 $packaging1 ['Description'] = 'Rate';
 $package1 ['PackagingType'] = $packaging1;
 $dunit1 ['Code'] = 'IN';
 $dunit1 ['Description'] = 'inches';
 $dimensions1 ['Length'] = '5';
 $dimensions1 ['Width'] = '4';
 $dimensions1 ['Height'] = '2';
 $dimensions1 ['UnitOfMeasurement'] = $dunit1;
 $package1 ['Dimensions'] = $dimensions1;
 $punit1 ['Code'] = 'LBS';
 $punit1 ['Description'] = 'Pounds';
 $packageweight1 ['Weight'] = '50';
 $packageweight1 ['UnitOfMeasurement'] = $punit1;
 $package1 ['PackageWeight'] = $packageweight1;

 //$packaging2['Code'] = '02';
 //$packaging2['Description'] = 'Rate';
 //$package2['PackagingType'] = $packaging2;
 //$dunit2['Code'] = 'IN';
 //$dunit2['Description'] = 'inches';
 //$dimensions2['Length'] = '3';
 //$dimensions2['Width'] = '5';
 //$dimensions2['Height'] = '8';
 //$dimensions2['UnitOfMeasurement'] = $dunit2;
 //$package2['Dimensions'] = $dimensions2;
 //$punit2['Code'] = 'LBS';
 //$punit2['Description'] = 'Pounds';
 //$packageweight2['Weight'] = '50';
 //$packageweight2['UnitOfMeasurement'] = $punit2;
 //$package2['PackageWeight'] = $packageweight2;

 $shipment['Package'] = array( $package1 ); //, $package2
 $shipment['ShipmentServiceOptions'] = '';
 $shipment['LargePackageIndicator'] = '';
 $request['Shipment'] = $shipment;

 echo "Request.......\n";
 //print_r($request);
 echo "\n\n";
 return $request;
 }

 try
 {
 $mode = array
 (
 'soap_version' => 'SOAP_1_1', // use soap 1.1 client
 'trace' => 1
 );

 // initialize soap client
 $client = new SoapClient($wsdl , $mode);

 //set endpoint url
 $client->__setLocation($endpointurl);

 //create soap header
 $usernameToken['Username'] = $userid;
 $usernameToken['Password'] = $passwd;
 $serviceAccessLicense['AccessLicenseNumber'] = $access;
 $upss['UsernameToken'] = $usernameToken;
 $upss['ServiceAccessToken'] = $serviceAccessLicense;

 $header = new SoapHeader('http://www.ups.com/XMLSchema/XOLTWS/UPSS/v1.0','UPSSecurity',$upss);

 $client->__setSoapHeaders($header);

 //get response
 $resp = $client->__soapCall($operation, array(processRate()));

 //get status
 echo "Response Status: " . $resp->Response->ResponseStatus->Description ."\n";

 /* save in json format the last response from the server. */
 $json = json_encode($client->__getLastResponse());
 //$json = json_encode(simplexml_load_file('XOLTResult.xml'));
 echo $json;
 echo 'Entrou no Json';;

 //save soap request and response to file
 $fw = fopen($outputFileName , 'w');

 fwrite($fw , "Request: \n" . $client->__getLastRequest() . "\n");
 fwrite($fw , "Response: \n" . $client->__getLastResponse() . "\n");

 fclose($fw);

 }
 catch(Exception $ex)
 {
 print_r ('Exception Error : '.$ex);
 }

?>

Alguem por favor teria uma dica de como eu posso implementar isso via Ajax ?

Agradeco a todos um forte abraco.