code: function (queueNumber, customParams, callback) {
        [queueNumber, customParams, callback] = doArgs(arguments, ['string|number', ['object', {}], 'function']);
  
        doRequest({
          urlPattern: [QUEUE_ITEM, queueNumber]
        }, customParams, callback);
      }
docs: Get one queued item
  
  @param {string} queueNumber
  @param {object|undefined} customParams is optional
  @param {function} callback