微信小程序调用微信支付

1，首先我们先缕清支付的整个流程，详见https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_4&index=3，第一步在自己的服务器上吊起微信支付，获取预支付订单id，第二步根据获取得APPID、随机数、预支付订单prepay_id、签名类型、时间生成签名，第三部将生成的签名和第一步获取得到信息一同返回给小程序，第四步小程序接收值发起支付

2.话不多说直接看代码

第一：吊起微信支付该方法返回的值有你需要得到prepay_id、随机字符串、签名类型、时间。还有一个签名切记这个签名不是我们给小程序的

    protected function weixin_pay($order)
    {
        Loader::import("weixinpay.lib.WxPay", EXTEND_PATH, ".Api.php");
        Loader::import("weixinpay.example.log", EXTEND_PATH, ".php");
        Loader::import("weixinpay.example.WxPay", EXTEND_PATH, ".Config.php");
        $notify=new NativePay();
        $logHandler= new \CLogFileHandler(EXTEND_PATH."weixinpay/logs/".date('Y-m-d').'.log');
        $log = \Log::Init($logHandler, 15);
        $input = new \WxPayUnifiedOrder();
        $input->SetBody("xiaoasdhjasd");
        $input->SetAttach("asdasd");
        $input->SetOut_trade_no($order["order_number"]);
       // $input->SetTotal_fee($order["money"]*100);
       $input->SetTotal_fee("1");
        $input->SetTime_start(date("YmdHis"));
        $input->SetTime_expire(date("YmdHis", time() + 600));
        $input->SetGoods_tag("test");
        $input->SetNotify_url("https://test.gdzhisheng.top/index.php/index/index/notify.html");
       $input->SetTrade_type("JSAPI");
        $input->SetProduct_id("407038");
$openid=$this->openid;
        $input->SetOpenid($openid);
        $api=new \WxPayApi();
        $config=new \WxPayConfig();
        $order = $api->unifiedOrder($config,$input);
return $order;
    }

第二：将上一个方法得到的参数进行签名

    private function genPaySign($unifiedOrder, $time)
    {

//$unifiedOrder是上一个方法返回的参数$time是一个时间戳

 　　　　　　$appId = "你的appid";
　　　　　　$key="你的商户密钥";
        $nonceStr = $unifiedOrder['nonce_str'];
        $package = 'prepay_id='.$unifiedOrder['prepay_id'];
        $signType = "MD5";
        $timeStamp = $time;
       
        $sign = MD5("appId={$appId}&nonceStr={$nonceStr}&package={$package}&signType={$signType}&timeStamp={$timeStamp}&key={$key}");
     
        return $sign;
    }

第三：微信小程序下单，去后台获取, 发起支付

  xiadan: function (options) {var that = this;
    var http = getApp();
    var url = http.globalData.url
    var openid = http.globalData.openid
      wx.request({
        url: url + '/index.php/index/index/buy_oneorder',
        method: 'POST',
        data: {
          openid: openid,
          order_id: options.order_id
        },
        success: function (res) {
          that.setData({
            order_id: options.order_id,
            timeStamp: res.data.time,
            nonceStr: res.data.pay.nonce_str,
            package: res.data.pay.prepay_id,
            paySign: res.data.sign,
          })
}
      })
},

buybuy:function(){

var that=this;

var http = getApp();

var openid = http.globalData.openid;

var url = http.globalData.url;

wx.requestPayment({

timeStamp: that.data.timeStamp,

nonceStr: that.data.nonceStr,

package: 'prepay_id=' + that.data.package,

signType: 'MD5',

paySign: that.data.paySign,

success: function (res) {

console.log('支付成功');

},

complete: function (res) {

console.log(res);

}

})

}

希望对你有所帮助！