Google script parse XML

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Javascript

XML

Google

parsing

Hi, I'm trying to get the value of all the fields in the loop, then insert data into googlesheet.
XML:

<issues total_count="210" offset="0" limit="25" type="array">
    <issue>
    <id>22079</id>
    <project id="21" name="name1"/>
    <description>Some text</description>
    <start_date>2017-11-22</start_date>
    <custom_fields type="array">
    <custom_field id="36" name="cf_36">
    <value>cf_36_value</value>
    </custom_field>
    <custom_field id="28" name="cf_28">
    <value>cf_28_value</value>
    </custom_field>
    <value type="array"/>
    </custom_field>
    </custom_fields>
    </issue>

What I have tried:

function APIRequest (url,sheet) {

  var xml = UrlFetchApp.fetch(url).getContentText();

  var DOC = Xml.parse(xml);
  var issues = DOC.issues.issue

  for(var c=0; c<issues.length;c++){
   var issue = issues[c];
    var id = issue.getElement('id').getText();

  sheet.appendRow([id]);
  }
 }

My problem is that I cann't get the values "cf_36_value" from XML for each "issue"
Help me plz