# 微信支付 - 统一下单
配置订单参数，trade_type 默认为 JSAPI，因此需要 openid，获取 openid 可使用 OAuth 网页授权
```php
$options = array(
'body' => 'iphone 6 plus',
'total_fee' => 1,
'openid' => 'user openid',
'out_trade_no' => date('YmdHis').mt_rand(10000, 99999),
'notify_url' => 'Your notify url'
);
```
统一下单需要注入 Wechat 对象，getResponse 方法在发生错误发抛出 \Exception 异常
```php
$unifiedorder = new Unifiedorder($wechat, $options);
try {
$response = $unifiedorder->getResponse();
} catch (\Exception $e) {
exit($e->getMessage());
}
var_dump($response);
```
统一下单响应结果
```php
Array
(
[return_code] => SUCCESS
[return_msg] => OK
[appid] => wx345f3830c2897po4
[mch_id] => 1241642124
[nonce_str] => hcenddZlBKOHzulZ
[sign] => 8CC689EB26D1234ACE219795C64BEE81
[result_code] => SUCCESS
[prepay_id] => wx201510041901594ea5e896a00156575586
[trade_type] => JSAPI
)
```
