如何异步获取braintree中的交易状态信息？

var gateway = braintree.connect({
  environment: braintree.Environment.Sandbox,
  merchantId: 'your_merchant_id',
  publicKey: 'your_public_key',
  privateKey: 'your_private_key'
});

gateway.transaction.find('transaction_id', function(err, transaction) {
  if (err) {
    // 处理错误情况
    console.error(err);
    return;
  }

  // 获取交易状态
  var status = transaction.status;
  console.log('交易状态: ' + status);

  // 获取付款方式
  var paymentMethod = transaction.paymentInstrumentType;
  console.log('付款方式: ' + paymentMethod);

  // 获取交易金额
  var amount = transaction.amount;
  console.log('交易金额: ' + amount);

  // 获取交易时间
  var transactionTime = transaction.createdAt;
  console.log('交易时间: ' + transactionTime);
});