easyalipay/docs/Payment/Query.md

## 交易查询

#### 配置
```php
use EasyAlipay\Factory;

$options = [

    'app_id'                   => '2016051900098985',
    'alipay_public_key'        => '支付宝公钥',
    'merchant_private_key'     => '应用私钥',
    // ...
];

$app = Factory::payment($options);

$app['query']->query($out_trade_no));`
```
参数说明

out_trade_no：out_trade_no：订单支付时传入的商户订单号，长度不超过64。