scratch OCLC NCIP function that's not being used?

ncip.lookupuser.js

NCIP.prototype.lookupUser = function(userPrincipalID, opts, cb) {
  var fieldPossibilities = ['LoanedItems', 'AccountDetails', 'RequestedItems'];
  var fieldsDefaults = {
    LoanedItems: {
      _el: {
        value: 'Loaned Items',
        element: 'ElementType'
      },
      start: {
        value: 1,
        element: 'StartElement'
      },
      max: {
        value: 10,
        element: 'MaximumCount'
      },
      sortField: {
        value: 'Date Due',
        element: 'SortField'
      },
      sortOrder: {
        value: 'Ascending',
        element: 'SortOrderType'
      }
    },

    AccountDetails: {
      _el: {
        value: 'Account Details',
        element: 'ElementType'
      },
      start: {
        value: 1,
        element: 'StartElement'
      },
      max: {
        value: 10,
        element: 'MaximumCount'
      },
      sortField: {
        value: 'Accrual Date',
        element: 'SortField'
      },
      sortOrder: {
        value: 'Ascending',
        element: 'SortOrderType'
      }
    },
    
    RequestedItems: {
      _el: {
        value: 'Requested Items',
        element: 'ElementType'
      },
      start: {
        value: 1,
        element: 'StartElement'
      },
      max: {
        value: 10,
        element: 'MaximumCount'
      },
      sortField: {
        value: 'Date Placed',
        element: 'SortField'
      },
      sortOrder: {
        value: 'Ascending',
        element: 'SortOrderType'
      }
    }
  };

  if ( typeof opts === 'function' ) {
    cb = opts;
    opts = {};
  }

  var opts = opts || {}
    , agencyID = opts.agencyID || this.agencyID
    , fields = opts.fields || {}
    , wskey = opts.wskey || this.wskey
    , ext = []
    , url = 'https://' + agencyID + '.share.worldcat.org/ncip/circ-patron'
    , data
    ;

  url += '?principalID=' + wskey.user.principalID
      +  '&principalIDNS=' + wskey.user.principalIDNS
      ;

  data = [
    util.xmlHeader(),
    '<NCIPMessage xmlns="http://www.niso.org/2008/ncip" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ncip="http://www.niso.org/2008/ncip" xmlns:ns2="http://oclc.org/WCL/ncip/2011/extensions" xsi:schemaLocation="http://www.niso.org/2008/ncip http://www.niso.org/schemas/ncip/v2_01/ncip_v2_01.xsd" ncip:version="http://www.niso.org/schemas/ncip/v2_01/ncip_v2_01.xsd">',
      '<LookupUser>',
        util.initiationHeader(agencyID),
        util.userID(userPrincipalID, agencyID)
  ];

  if ( fields instanceof Array ) {
    var fieldObj = {};
    fields.forEach(function(fld) { fieldObj[fld] = {} });
    fields = fieldObj;
  }

  for (var field in fields) {
    if ( !fields.hasOwnProperty(field) && fieldPossibilities.indexOf(field) === -1 ) continue;

    var defaults = fieldsDefaults[field];
    var current = fields[field];

    // add `<LoanedItemsDesired/>` tag to the body
    data.push(util.tag(field + 'Desired'));

    // add opening tag to `<ext>` collection
    ext.push('<ResponseElementControl>');

    for (var f in defaults) {
      if ( current[f] ) {
        ext.push(util.tag(defaults[f].element, current[f]));
      } else {
        ext.push(util.tag(defaults[f].element, defaults[f].value));
      }
    }

    // close up shop
    ext.push('</ResponseElementControl>');
  }

  if ( ext.length ) {
    data.push(util.tag('Ext', ext.join('')));
  }

    data.push('</LookupUser>');
  data.push('</NCIPMessage>');

  return sendRequest({
    url: url,
    method: 'POST',
    wskey: wskey,
    data: data.join(''),
    ignoreTags: ['LookupUserResponse'],
    callback: cb
  });
}