Receipt returned by apple is different format about node-iap HOT 10 CLOSED

{ receipt: 
   { receipt_type: 'ProductionSandbox',
     adam_id: 0,
     app_item_id: 0,
     bundle_id: 'com.abc.test',
     application_version: '1.0',
     download_id: 0,
     version_external_identifier: 0,
     request_date: '2015-06-09 10:22:59 Etc/GMT',
     request_date_ms: '1433845379569',
     request_date_pst: '2015-06-09 03:22:59 America/Los_Angeles',
     original_purchase_date: '2013-08-01 07:00:00 Etc/GMT',
     original_purchase_date_ms: '1375340400000',
     original_purchase_date_pst: '2013-08-01 00:00:00 America/Los_Angeles',
     original_application_version: '1.0',
     in_app: [ [Object] ] },
  transactionId: undefined,
  productId: undefined,
  platform: 'apple' }

/* jshint camelcase:false */
if (payment.hasOwnProperty('productId') && payment.productId !== receipt.product_id) {
    return cb(new Error('Wrong product ID: ' + payment.productId + ' (expected: ' + receipt.product_id + ')'));
}