Adwords API Batch Jobs, XML SOAP

[jack . e . perry4]

Hello!

So I am using XML SOAP directly, no client library. I am trying to obtain 
the resumable URL for my batch job that is created. I post an empty HTTP 
Request but keep receiving an error about my signature.

Here is my request: 
function getResumableUrl(uploadUrl) {
  var authToken = findAccessToken();
  var xml =  '<soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"; 
xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>' +
     '<soapenv:Header>' +
       '<ns1:RequestHeader 
xmlns:ns1="https://adwords.google.com/api/adwords/cm/v201806"; 
soapenv:actor="http://schemas.xmlsoap.org/soap/actor/next"; 
soapenv:mustUnderstand="0">' +
         '<ns1:clientCustomerId>INSERT HERE</ns1:clientCustomerId>' +
         '<ns1:developerToken>INSERT HERE</ns1:developerToken>' +
         '<ns1:userAgent>Batch Job Resumable Test</ns1:userAgent>' +
         '<ns1:validateOnly>false</ns1:validateOnly>' +
         '<ns1:partialFailure>true</ns1:partialFailure>' +
       '</ns1:RequestHeader>' +
    '</soapenv:Header>' +
      '<soapenv:Body>' +
        '</soapenv:Body>' +
  '</soapenv:Envelope>';
  
        
  var headers = {
        "content-type": "application/x-www-form-urlencoded",
                 "x-goog-resumable": "start",
                 "expires": test
                };
  
  var options = {
    "Authorization": "Bearer " + authToken,
    "Content-Length ": 0,
    'Method': "post",
    'headers': headers,
    muteHttpExceptions: true,
    payload: xml
  };
  Logger.log(uploadUrl);
  var response = UrlFetchApp.fetch(uploadUrl, options);
  Logger.log(response);
}

Here is the response: 
<?xml version='1.0' 
encoding='UTF-8'?><Error><Code>SignatureDoesNotMatch</Code><Message>The 
request signature we calculated does not match the signature you provided. 
Check your Google secret key and signing method.</Message><StringToSign>POST

application/x-www-form-urlencoded
1529679903
x-goog-resumable:start
/batch-job-upload-prod-ebe9b43/273175195/763146464.operations.xml</StringToSign></Error>

I have tried so many different variations and have read through all of the 
documentation. Does anyone see anything that is triggering this? Thank you 
so much!

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