微信 之小程序支付

1、小程序開通微信支付

2、小程序支付的交互圖

3、在商戶平臺添加受權申請單

 

 

4、在小程序後臺 M-A受權

點擊查看進入以下界面，而後肯定綁定

 

5、下載與安裝證書

 

7、後臺參數配置

8、具體代碼實

$pay_data = [
     'appId' => 小程序appid,
     'timeStamp' => time(),
     'nonceStr' => md5(uniqid()),
     'package' => 小程序傳給後臺的prepay_id,
     'signType' => 'MD5',
];

 經過後臺加密獲得paySign，而後傳給小程序調用API喚起微信支付

wx.requestPayment({
　　'timeStamp': '',
　　'nonceStr': '',
　　'package': '',
　　'signType': 'MD5',
　　'paySign': '',
　　'success':function(res){},
　　'fail':function(res){},
　　'complete':function(res){}
})

附小程序支付文檔：https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_3&index=1

下面是具體代碼實現：

微信小程序支付類封裝：

class WeixinPay
{
    protected $appid;
    protected $mch_id;
    protected $key;
    protected $openid;
    protected $out_trade_no;
    protected $body;
    protected $total_fee;

    function __construct($appid, $openid, $mch_id, $key, $out_trade_no, $body, $total_fee)
    {
        $this->appid = $appid;
        $this->openid = $openid;
        $this->mch_id = $mch_id;
        $this->key = $key;
        $this->out_trade_no = $out_trade_no;
        $this->body = $body;
        $this->total_fee = $total_fee;
    }

    public function pay()
    {
        //統一下單接口
        $return = $this->weixinapp();
        return $return;
    }


    //統一下單接口
    private function unifiedorder()
    {
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $parameters = array(
            'appid' => $this->appid, //小程序ID
            'mch_id' => $this->mch_id, //商戶號
            'nonce_str' => $this->createNoncestr(), //隨機字符串
//            'body' => 'test', //商品描述
            'body' => $this->body,
//            'out_trade_no' => '2018013106125348', //商戶訂單號
            'out_trade_no' => $this->out_trade_no,
//            'total_fee' => floatval(0.01 * 100), //總金額 單位 分
            'total_fee' => $this->total_fee,
            'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //終端IP
            // 'spbill_create_ip' => '192.168.0.161', //終端IP
            'notify_url' => 'payNotify.php', //通知地址  確保外網能正常訪問
            'openid' => $this->openid, //用戶id
            'trade_type' => 'JSAPI'//交易類型
        );
        //統一下單簽名
        $parameters['sign'] = $this->getSign($parameters);
        $xmlData = $this->arrayToXml($parameters);
        $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
        return $return;
    }


    private static function postXmlCurl($xml, $url, $second = 30)
    {
        $ch = curl_init();
        //設置超時
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //嚴格校驗
        //設置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求結果爲字符串且輸出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        set_time_limit(0);
        //運行curl
        $data = curl_exec($ch);
        //返回結果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            throw new WxPayException("curl出錯，錯誤碼:$error");
        }
    }


    //數組轉換成xml
    private function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }


    //xml轉換成數組
    private function xmlToArray($xml)
    {
        //禁止引用外部xml實體
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
        $val = json_decode(json_encode($xmlstring), true);
        return $val;
    }


    //微信小程序接口
    private function weixinapp()
    {
        //統一下單接口
        $unifiedorder = $this->unifiedorder();
        $parameters = array(
            'appId' => $this->appid, //小程序ID
            'timeStamp' => '' . time() . '', //時間戳
            'nonceStr' => $this->createNoncestr(), //隨機串
            'package' => 'prepay_id=' . $unifiedorder['prepay_id'], //數據包
            'signType' => 'MD5'//簽名方式
        );
        //簽名
        $parameters['paySign'] = $this->getSign($parameters);
        return $parameters;
    }


    //做用：產生隨機字符串，不長於32位
    private function createNoncestr($length = 32)
    {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    //做用：生成簽名
    private function getSign($Obj)
    {
        foreach ($Obj as $k => $v) {
            $Parameters[$k] = $v;
        }
        //簽名步驟一：按字典序排序參數
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //簽名步驟二：在string後加入KEY
        $String = $String . "&key=" . $this->key;
        //簽名步驟三：MD5加密
        $String = md5($String);
        //簽名步驟四：全部字符轉爲大寫
        $result_ = strtoupper($String);
        return $result_;
    }


    ///做用：格式化參數，簽名過程須要使用
    private function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
}

payNotify.php代碼：

$postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信參數
// 接受不到參數可使用file_get_contents("php://input"); PHP高版本中$GLOBALS好像已經被廢棄了
if (empty($postXml)) {
    return false;
}

//將xml格式轉換成數組
function xmlToArray($xml) {
    //禁止引用外部xml實體
    libxml_disable_entity_loader(true);
    $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
    $val = json_decode(json_encode($xmlstring), true);
    return $val;
}
$attr = xmlToArray($postXml);
$total_fee = $attr['total_fee'];
$open_id = $attr['openid'];
$itemid = $attr['out_trade_no'];
$time = $attr['time_end'];
//你的回調邏輯。。。

獲取小程序頁面參數：

$weixinPay = new  WeixinPay($appId, $openid, $mch_id, $key, $out_trade_no, $body, $total_fee);
$parameters = $weixinPay->pay();

將$parameters傳給小程序：

wx.requestPayment({
    'timeStamp': res.data.timeStamp,
    'nonceStr': res.data.nonceStr,
    'package': res.data.package,
    'signType': 'MD5',
    'paySign': res.data.paySign,
    'success': function (res) {
        console.log('success');
        wx.showToast({
            title: '支付成功',
            icon: 'success',
            duration: 3000
        });
    },
    'fail': function (res) {
        console.log(res);
    },
    'complete': function (res) {
        console.log('complete');
    }
});