# 微信支付 - JSAPI chooseWXPay
chooseWXPay 接口依赖于 JSSDK，因此需要先注入 JSSDK 配置：
```php
use Thenbsp\Wechat\Jssdk;
/**
* 生成 JSSDK 配置文件
*/
$jssdk = new Jssdk($accessToken);
$jssdk->addApi('chooseWXPay');
$jssdkConfigJSON = $jssdk->getConfig();
```
PHP：
```php
use Thenbsp\Wechat\Payment\JsChooseWXPay;
$options = array(
'body' => 'iphone 6 plus',
'total_fee' => 1,
'out_trade_no' => date('YmdHis').mt_rand(10000, 99999),
'notify_url' => 'Your notify url',
'openid' => $_SESSION['openid']
);
$o = new JsChooseWXPay($wechat, $options);
$paymentConfigJSON = $o->getConfig();
```
Javascript：
```javascript
// 注入 JSSDK 配置
wx.config(<?php echo $jssdkConfigJSON; ?>);
// 点击支付按款
var WXPayment = function() {
var config = <?php echo $paymentConfigJSON; ?>;
config.success = function() {
alert('支付成功！');
}
config.cancel = function() {
alert('用户取消成功！');
}
wx.chooseWXPay(config);
}
```
HTML：
```html
<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
<button type="button" onclick="WXPayment()">支付 ￥<?php echo ($options['total_fee'] / 100); ?> 元</button>
```
